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How the Rare Breed Trigger Works and Why It Is So Controversial

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What Exactly Is a Rare Breed Trigger and Why Do Shooters Want One?

A rare breed trigger is a drop-in replacement for your AR-15’s standard fire control group that simulates full-auto fire while remaining a semi-automatic mechanism. It achieves this through a patented, force-based reset system: you frt-mr3 hold the trigger down, and the bolt’s forward motion physically trips the sear, firing the next round the instant the action closes. This creates a cyclic rate of 600–900 rounds per minute, mimicking a machine gun’s burst without any modification to the lower receiver’s classification. Shooters want one for the sheer practical speed—it allows rapid follow-up shots on target with zero trigger-finger fatigue, making it ideal for competitive drills, close-quarters transitions, and suppression fire. More than a novelty, it’s a genuine force-multiplier that exploits the rifle’s existing recoil energy to deliver ultra-fast trigger resets that no standard trigger can match. Why shooters want a rare breed trigger comes down to gaining a legal, mechanical edge that turns a semiauto into what feels like a controllable burst weapon.

The Core Design Difference Compared to Factory Triggers

The core design difference compared to factory triggers lies in the forced-reset sear mechanism, which physically pushes the trigger forward after each shot without requiring a full finger release. Factory triggers rely on a spring-driven return that demands you to relax your pull, creating a natural pause between rounds. A Rare Breed trigger instead uses a sliding cam that actively resets the trigger while your finger remains depressed, allowing the hammer to follow the bolt carrier group’s cyclic motion. This eliminates the “wall” you feel on stock triggers, producing a continuous, bump-fire-like rhythm. However, the trigger’s aggressive reset can feel jarring for precision shooting, as it favors speed over finesse.

• Factory triggers require a conscious finger lift; Rare Breed resets automatically.
• The sear geometry changes from a rotational to a linear sliding action.
• Trigger pull weight stays constant, but the reset travel is drastically shortened.
• No disconnector delay exists, unlike factory designs that interrupt the cycle.

Who Benefits Most From This Type of Trigger System

If you’re into fast, controlled shooting without swapping your AR’s guts, the rare breed trigger is built for you. Competitive shooters who want to shave fractions off their split times benefit most, since the forced-reset lets you keep your finger down and ride the recoil for quicker follow-up shots. Three-gun and practical shooters also win big, as it rewards a firm, consistent grip and a steady support hand—no need to learn a weird bump-fire dance. Tactical trainers practicing rapid target transitions get the most out of it, because the trigger teaches you to manage muzzle rise naturally. Casual plinkers who just want a fun, adrenaline-pumping range day will love it too, but only if you can handle the attention it draws.

1. Competitive shooters needing raw speed.
2. Trainers drilling multiple-target transitions.
3. Enthusiasts who enjoy a unique, tactile shooting experience.

Common Misconceptions About the Trigger’s Purpose

A common misconception is that a rare breed trigger’s purpose is simply to increase cyclic rate for competition. In reality, its design centers on replicating binary-style reset timing, not pure speed. Shooters often assume it’s a full-auto conversion, which is false—it still requires one pull per shot, but the sear trip happens twice per cycle. Another myth: it’s meant to fix trigger pull weight. Actually, its purpose is the forced reset rhythm, which changes how you manage recoil and follow-through, not how hard rarebreed frt you press. Q: Is the trigger’s purpose to make the rifle fire faster than legal semi-auto? A: No—it’s about the mechanical feel and reset, not exceeding legal shot limits; the speed is a byproduct, not the goal.

How Does the Rare Breed Trigger Mechanism Actually Work?

The Rare Breed trigger (FRT) mechanism works by eliminating the traditional disconnector, allowing the hammer to follow the bolt carrier forward during the firing cycle. When you pull and hold the trigger, the sear releases the hammer, but the bolt’s rearward travel trips a trigger-reset lever that re-engages the sear without you releasing your finger. As the bolt returns to battery, it strikes the hammer, which then drops again—creating a forced-reset binary-like cycle that fires one round on the pull and one on the reset, but at a rate controlled by your trigger finger’s pressure. The critical detail is the lever’s geometry interacts with the bolt carrier’s cam pin path, so timing shifts if you change buffer weights or bolt mass, altering the reset point and causing malfunctions if not tuned. For reliability, keep the carrier and trigger pocket clean; carbon buildup here slows the lever’s return.

Breaking Down the Forced Reset Function Step by Step

The forced reset function relies on a mechanical sequence initiated the moment the bolt carrier begins its rearward travel. First, the trigger’s sear surface is cammed downward by the bolt’s angled ramp, disengaging the hammer. Second, the carrier’s forward stroke pushes a reset trip that physically shoves the trigger forward, re-engaging the sear before the hammer can follow. Third, the shooter’s finger must remain pinned to the trigger’s face, allowing the trip to overcome trigger return spring tension. Fourth, the hammer releases as the carrier reaches battery, cycling automatically without a disconnector. This step-by-step forced reset sequence eliminates the need for a sear catch and relies entirely on bolt momentum timing.

• Bolt ramp angle determines sear disengagement speed and reset timing.
• Forward carrier motion, not spring pressure, drives the trigger re-engagement.
• Finger pressure must be constant; any relaxation halts the cycle.
• Hammer release coincides with full bolt lockup, not trigger travel.

What Happens to the Trigger Reset During Rapid Fire

During rapid fire, the trigger reset during rapid fire is fully automatic—you never feel the usual wall or click. The bolt’s forward motion physically kicks the trigger shoe forward while the hammer is still held back, so the sear re-engages before the bolt even locks. That means your finger stays pinned to the rear, and the reset happens so fast it overlaps with the next shot’s break. Practically, you don’t “let off” anything; the mechanism does the timing for you. If you try to manually reset, you’ll actually fight the system and cause short strokes. Just hold the trigger down and let the carrier do the work.

The Role of Bolt Carrier Movement in the Firing Cycle

The bolt carrier’s rearward travel is the singular mechanical cue that resets the Rare Breed’s trigger sear. As the carrier moves aft after firing, its underside strikes the trigger’s trip lever, forcing the trigger forward and re-engaging the hammer catch before the carrier returns. This pre-travel reset happens *while the bolt is still rearward, so the hammer drops again the instant the carrier closes, not on trigger release.* The carrier’s velocity and stroke length determine reset timing; too short a stroke or weak buffer spring causes a dead trigger, while excessive carrier speed can outrun the sear’s re-engagement, producing hammer follow. Proper carrier mass and buffer tuning are therefore non-negotiable for consistent binary-like cycling.

How to Install and Set Up Your New Trigger Correctly

To get your rare breed trigger installed correctly, start by clearing the lower receiver completely. Drop the trigger assembly into the pocket, ensuring the rear pin seats flush before pressing the front pin through—never force it. The hammer should sit forward, and the disconnect must be free of debris. Once the upper is attached, do a manual function check: charge the handle, then hold the trigger back while slowly returning the bolt. You should hear a distinct «click» as the trip resets. For proper trigger setup, adjust the set screw on the rear of the housing until there’s zero over-travel but the hammer still releases cleanly. Use a light oil on the sear surfaces only—avoid grease, as it collects carbon. Test with snap caps first, then live fire to confirm the reset cycle.

Tools You’ll Need Before Starting the Installation

Before beginning your rare breed trigger installation, gather a bench block, a punch set with roll-pin punches, and a non-marring hammer. You will also need a small flathead screwdriver for retaining pin removal and needle-nose pliers for spring control. A trigger jig or clamp is optional but stabilizes the lower receiver during pin insertion. Verify you have the correct size drift punch for the trigger and hammer pins, as oversized punches can damage the receiver. Finally, keep a clean, magnetized tray nearby to prevent losing the sear spring or disconnector. These tools ensure precise pin alignment and prevent frame scratches.

• Roll-pin punch set (3/32” and 1/8”)
• Non-marring nylon hammer
• Bench block with receiver recess
• Trigger jig for stable pin alignment

Step-by-Step Fitment Guide for AR-15 Lower Receivers

Begin by clearing the AR-15 lower receiver’s trigger pocket of debris, then insert the rare breed trigger cassette from the top, aligning its pivot pin hole with the receiver’s forward lug. For the rare breed’s unique sear trip, you must first seat the hammer fully rearward and lock the disconnector by hand, ensuring the trigger bow sits flush against the trigger guard’s rear wall. Next, press the hammer pin through the right side, then the trigger pin, verifying each rotates freely without binding. Finally, function-check the reset by pulling the trigger, holding it, and cycling the charging handle—if the hammer doesn’t catch, re-index the pins.

1. Align cassette’s front tab with receiver’s trigger pocket slot.
2. Insert pins from the right, tapping gently until flush.
3. Push hammer down and confirm sear engagement audibly.
4. Test dry-fire with upper removed to feel the rare breed’s short reset.

Adjusting the Trigger Spring Tension for Optimal Performance

After installing your rare breed trigger, begin by turning the spring tension screw in small, quarter-turn increments. Test the reset and pull weight after each adjustment, as excessive tension causes drag while insufficient tension risks light primer strikes or slam-fires. The optimal setting is the minimum tension that reliably resets the trigger and ignites primers. Use a trigger pull gauge to verify consistency, aiming for a crisp, repeatable break without creep. Mark your final screw position with a paint pen for future reference. Adjusting the trigger spring tension for optimal performance requires balancing speed against safety—too light compromises control, too heavy defeats the design’s rapid-fire capability.

Q: How do I know if the trigger spring tension is set incorrectly?
A: A trigger that fails to reset fully or fires irregularly indicates too little tension; excessive tension shows as a heavy, sluggish pull that slows your cadence.

What Are the Real-World Benefits and Performance Gains?

The primary real-world benefit of a rare breed trigger is the dramatic reduction in lock time, allowing you to fire as fast as your finger can physically reset, which translates to tighter shot strings during rapid follow-ups. This performance gain is most tangible in competition or practical drills where shaving milliseconds off each split time directly improves your final score, and it makes maintaining a stable sight picture considerably easier under recoil. You will experience significantly less trigger pull fatigue during high-round-count sessions, as the pull weight is often halved mp5 frt trigger compared to standard triggers, preserving hand strength for other shooting mechanics. *However, this speed is only an advantage if your grip and recoil control are solid enough to keep the muzzle from dipping between shots.* The accelerated cadence also helps you stay in a natural rhythm, reducing the tendency to anticipate the break and flinch, which is a common performance killer with heavier triggers.

How It Feels During Live Fire: Pull Weight and Reset Feel

During live fire, the Rare Breed trigger’s pull weight feels remarkably consistent, hovering near a crisp 3.5–4.5 pounds with no perceptible creep before the break. The reset is where the sensation diverges from standard drop-in units: it is short, tactile, and almost immediate, requiring only a slight forward release of the finger before the trigger re-engages with a distinct click. This abbreviated reset rewards a disciplined, static grip because any residual finger pressure can cause the disconnector to slip without a full reset. In rapid strings, the shooter perceives a rhythmic “snap-snap” cadence rather than a deliberate mushy wall, which translates directly into faster follow-up shots with zero trigger-slop hesitation. The pull never stacks or becomes heavier during sustained fire, preserving point-of-aim consistency across magazines.

Accuracy Improvements for Controlled Pairs and Follow-Up Shots

The rare breed trigger shines brightest when you’re ripping off controlled pairs and follow-up shots. Because the reset is almost instant and the trigger cycle is force-reset, your second round breaks with barely any finger movement. That means your sights stay glued to the target instead of dipping low between shots. You’ll notice tighter groups on double-taps because you’re not fighting a long, mushy reset or re-establishing your grip. Follow-up shots become a rhythm, not a scramble—each pull feels identical, so your muscle memory locks in faster. It’s less about speed and more about keeping that front sight stable while the gun cycles.

• Reduced trigger travel keeps your aim point consistent between shots.
• No need to fully release the trigger, so finger position stays locked.
• Faster reset lets your second round land before your body shifts.
• Repeatable pull weight prevents flinching on rapid follow-ups.

Durability Considerations for High-Round-Count Shooters

For high-round-count shooters, the rare breed trigger’s longevity hinges on its proprietary sear and hammer engagement surfaces, which experience accelerated wear under rapid-fire stress. Regular inspection of the trigger’s disconnect linkage and spring tension is critical, as carbon fouling can impede reset timing after 5,000+ rounds. Lubrication should focus on the cam surfaces, not the sear faces, to rare breed super safety avoid attracting grit that accelerates peening. Extended-service durability testing shows that replacing the return spring every 10,000 rounds prevents light primer strikes and maintains consistent reset force. Users should also monitor the trigger’s roller bearing for flat spots, which directly affect pull weight stability and reset reliability under sustained bump-fire sessions.

Q: What component fails first due to Durability Considerations for High-Round-Count Shooters? The disconnect spring typically fatigues first, leading to intermittent dead triggers, so stock a spare before the 8,000-round mark.

Which Parts and Accessories Pair Best With This Trigger?

For the Rare Breed trigger, the best pairing starts with a high-torque, mil-spec hammer and a heavy buffer system—specifically an H2 or H3 buffer—to manage the increased bolt carrier velocity during forced reset cycling. A low-friction nickel-boron or phosphate-coated carrier reduces drag, ensuring the trigger’s sear trips reliably. Use anti-walk pins with a retention spring, as the trigger’s aggressive reset can walk standard pins under rapid fire. Pair with a short-throw safety (45 or 60 degrees) to keep your finger clear during the binary-like return stroke, and a lightened, flat-faced trigger shoe—though the stock shoe is fine—only if you prefer a consistent pad.

Never pair it with a lightweight BCG or reduced-power buffer spring; those cause bolt bounce and slam-fires.

A drop-in hammer with a tuned spring weight (4.5–5.5 lbs) also helps avoid light strikes at high cyclic rates.

Choosing the Right Hammer and Bolt Carrier Group for Reliable Cycling

For reliable cycling with the Rare Breed trigger, the hammer and bolt carrier group must work as a synchronized unit, not as afterthoughts. Choose a hammer with a symmetrically profiled face to ensure the bolt carrier sweeps it cleanly without drag, preventing light primer strikes or short strokes. A carrier with a properly radiused tail and a smooth, phosphate-coated surface reduces friction against the hammer’s sear surfaces, while a heavier carrier helps drive the hammer back with enough momentum during rapid fire. Avoid lightweight carriers—they can bounce off the hammer, causing misfeeds. Test your pairing with snap caps to verify the bolt locks back fully before trusting it live.

Q: What is the most common cycling failure when pairing a hammer with the Rare Breed trigger?
A: A hammer with an angled or asymmetric face that causes the carrier to skip or catch, leading to hammer follow or incomplete resets. Always match the carrier’s forward travel to the hammer’s pivot speed.

Buffer Weight and Spring Combinations That Prevent Malfunctions

For the rare breed trigger, **buffer weight and spring combinations that prevent malfunctions** hinge on matching recoil impulse to carrier velocity. A standard carbine buffer often allows bolt bounce, disrupting the trigger’s sear reset. Instead, run an H2 or H3 buffer with a flat-wire spring—this increases forward pressure, keeping the bolt locked long enough for the trigger to catch. If you experience slam-fires or double taps, step up one weight class. Conversely, if the bolt short-strokes, drop to an H1 with a standard spring. Tuning is iterative: fire two rounds, adjust, repeat. The goal is a crisp, single reset with zero hammer follow.

Q: What buffer weight and spring combination prevents rare fn p90 frt breed trigger malfunctions?
A: Start with an H2 buffer and a flat-wire spring; this pairing absorbs excess carrier speed and prevents bolt bounce, the leading cause of reset failures. Swap to H3 only if residual bounce persists.

Lubrication Points That Keep the Reset Running Smoothly

For the rare breed trigger, critical lubrication points are the sear engagement surfaces, the trigger bow’s cam track, and the hammer’s reset lug. Apply a thin, grease-based lubricant (not oil) to these friction zones, as oil migrates away under rapid fire. The reset spring channel inside the trigger housing also needs a micro-drop of high-viscosity grease to prevent sluggish return. Wipe the trigger disconnector face dry—excess lube here causes gritty, delayed resets.

• Grease the cam track where the bolt carrier contacts the trigger trip lever.
• Lubricate the hammer pivot pin with a synthetic grease, not CLP.
• Keep the reset spring coil dry; lubricate only the spring’s end caps.
• Reapply every 500 rounds; carbon buildup depletes lubrication fast.

Frequently Asked Questions About Using This Trigger System

When using a rare breed trigger, the most frequent questions center on reset behavior and lubrication. Users often ask, “Does the trigger require a specific bolt carrier weight to function reliably?” Yes—lighter carriers can cause short-stroking, so maintain factory-spec weights. Another common query involves the audible “click” during reset; this is normal and indicates the sear trip is armed. For maintenance, apply a thin, grease-based lubricant to the trigger contact points every 500 rounds; dry oil attracts carbon and slows the reset. If you experience double fires, check that the hammer spring is oriented correctly. Finally, do not dry-fire without a snap cap, as the rare breed’s aggressive trip can peen the trigger’s cam surface, leading to inconsistent ignition. Keep the trigger group clean, and it will remain predictable.

Can I Use It in a Pistol-Caliber Carbine or Other Platforms?

Yes, you can install a Rare Breed trigger in a pistol-caliber carbine, provided the platform uses a standard AR-15 fire control group pocket. Direct blowback PCCs like 9mm ARs often have heavier bolt carrier groups and different hammer profiles, so verify that your trigger’s hammer clears the bolt face and does not interfere with the floating firing pin. For other platforms, such as bullpup conversions or aftermarket chassis systems, the trigger’s curved shape and geometry may conflict with the linkage. Compatibility depends on the specific lower receiver’s hammer channel and bolt carrier design, not just the caliber. Always test function with snap caps.

• Check AR-9 bolt carrier tail length for hammer clearance.
• Confirm the trigger housing fits polymer lowers without excessive flex.
• Use a heavy-duty hammer spring for reliable primer ignition on rifle rounds.
• Disable the trigger’s forced-reset feature if your platform uses a non-standard rare breed mp5 trigger sear trip.

Why Does My Trigger Occasionally Feel «Spongy» and How Do I Fix It?

A spongy feel in your Rare Breed trigger typically indicates carbon and fouling buildup in the trigger pack’s sear engagement surfaces. This accumulation cushions the hammer’s release, reducing the crisp reset you expect. First, disassemble the trigger unit and inspect the sear and disconnector for sticky residue. Clean these areas with a dry solvent and re-lubricate only with a light oil—heavy grease attracts debris. Another culprit is an over-tightened trigger housing screw, which distorts the frame and alters sear geometry. Back off the screw a quarter turn and test. If the sponginess persists, check the hammer spring for fatigue; a weakened spring can cause inconsistent engagement. Replacing it restores positive, tactile feedback.

Tips for Breaking In the Trigger During the First 200 Rounds

For the first 200 rounds, resist the urge to short-stroke the trigger; instead, focus on sustained, deliberate trigger control to properly seat the contact surfaces. Fire in semi-auto only—no binary or forced reset pulls—allowing the sear and trip lever to wear evenly. Apply a light grease to the hammer pin and trigger pivot points before every session, but avoid heavy oil that attracts carbon fouling. After each magazine, manually cycle the charging handle five times to polish the engagement surfaces. If you feel grit or a sticky reset, stop and dry-fire ten times to smooth the friction. By round 100, the pull should feel noticeably crisper; if it doesn’t, clean and re-lubricate before continuing.