Partisan Triggers Disruptor AR-15 FRT 3 Position Drop In Forced Reset Trigger

Last reviewed: 2026-04-18 by Jake Terry, FFL07/SOT3, with hands-on install experience on AR/AK/Glock platforms.

For shooters building duty-grade AR-15 rifles or upgrading existing platforms, the Partisan Disruptor forced reset trigger assembly delivers speed and precision without complex installation. Unlike retrofit assemblies requiring fitting or permanent modification, the Partisan Disruptor is a true drop-in replacement trigger. You remove the factory fire control group, seat the Disruptor cassette into the lower receiver, and insert the factory or supplied pins — no gunsmithing, no filing, no trial-and-error shimming. Tool steel and 4140 chromoly construction on all wear surfaces extends service life under high round counts.

The Mechanism

The Partisan Disruptor operates as a forced reset trigger, meaning the trigger bar resets automatically during the bolt carrier’s rearward travel after each shot is fired. In Enhanced Semi-Automatic mode, maintaining rearward finger pressure on the trigger allows the assembly to reset and fire the next round as soon as the bolt returns to battery. Each round fired requires a discrete trigger function — the bolt cycles, the hammer follows, the disconnector releases the hammer upon reset — and the trigger must move forward past the reset point before the next shot can fire. Federal law classifies this mechanism as semi-automatic fire; the trigger does not convert the firearm to automatic fire, and one round is discharged per completed trigger cycle.

Technical Breakdown

The three-position safety selector offers Safe, Semi-Automatic, and Enhanced Semi-Automatic modes. Safe blocks the trigger bar from releasing the hammer. Semi-Automatic functions as a standard semi-auto trigger with manual reset. Enhanced Semi-Automatic engages the forced reset mechanism, allowing faster follow-up shots when the shooter maintains rearward finger pressure through the reset cycle. Browse the full Super Safety Trigger category for additional AR-pattern trigger assemblies and fire control components.

Installation Overview

The Disruptor cassette seats directly into any mil-spec AR-15 lower receiver without modification. Remove the factory safety selector, hammer, trigger, and disconnector. Insert the Disruptor assembly, align the pin holes, and drive in the factory trigger and hammer pins (or supplied pins). Install the safety selector through the cassette’s integrated detent channel. Anti-walk pins are recommended to prevent lateral pin migration under sustained fire. No modifications to the lower receiver’s fire control pocket or safety shelf are required.

Buffer requirements vary by barrel length and stock type. For carbine-length gas systems and barrels 16 inches or shorter, use a minimum H2 buffer; an H3 buffer is recommended for optimal carrier timing and consistent reset function. For 20-inch barrels paired with A2 rifle-length stocks, a standard rifle buffer provides sufficient reciprocating mass. Underbuffered rifles may experience erratic reset timing or premature hammer follow; overbuffered rifles may short-stroke and fail to chamber the next round. Test-fire with the intended buffer and ammunition combination at the range before deploying the rifle for duty or competition use.

Who It’s For

The Partisan Disruptor suits shooters upgrading duty rifles, competition carbines, or recreational AR-15 builds who prioritize installation simplicity and rapid follow-up shot capability. The drop-in design appeals to builders without access to armorers’ tools or fitting jigs. The three-position safety allows toggling between standard semi-auto fire and enhanced semi-auto fire without swapping assemblies. Competitive 3-gun shooters running short-barreled AR pistols or SBRs benefit from the faster cyclic rate in timed stages; law enforcement armorers installing triggers in department-issued patrol rifles appreciate the no-modification install process.

Recreational shooters in jurisdictions permitting forced reset triggers use the Disruptor for range drills emphasizing rapid target transitions and mag dumps. The assembly does not suit shooters in states or counties prohibiting forced reset triggers, binary triggers, or enhanced fire control devices. Verify current federal ATF guidance and state statute before ordering; regulatory status has changed in the past and may change again.

At the Range

When firing in Enhanced Semi-Automatic mode, maintain consistent rearward finger pressure through the trigger’s full travel and reset cycle. The reset occurs at the end of the bolt carrier’s rearward stroke; releasing finger pressure prematurely interrupts the cycle and requires manual trigger reset. Sight picture maintenance and recoil management become critical at elevated cyclic rates — the rifle will fire as fast as the bolt carrier cycles if the shooter holds the trigger rearward. Practice trigger control drills at lower cyclic rates before attempting full-speed strings. Confirm zero and sight-in using Semi-Automatic mode before switching to Enhanced Semi-Automatic for timed drills.

Ammunition choice affects carrier velocity and reset consistency. NATO-spec 5.56×45mm loads with 55-grain FMJ bullets at 3,000+ fps provide sufficient gas pressure for reliable cycling with H2 or H3 buffers. Underpowered .223 Remington target loads may short-stroke the carrier and fail to complete the reset cycle. Confirm function with your chosen defensive or competition load before relying on the trigger in high-stakes scenarios.