Is it compatible with all AR-15 lowers?

Yes, it fits standard mil-spec AR-15 lower receivers with dimensions within 0.005 inches of specification. Some billet lowers with tight trigger pockets may require minimal fitting. Test fit before final assembly to ensure proper function.

Does it work with ambidextrous safety selectors?

No, the FRT-15L3™ requires use of the included selector drum and levers. Most aftermarket ambidextrous safeties will not function correctly with the forced reset mechanism. The kit includes both long and short lever options for user preference.

How long does installation take?

Installation typically takes 12-15 minutes with basic armorers tools. The drop-in design requires only pin removal and replacement. First-time installers should allow 20 minutes to ensure proper alignment and function testing before range use.

Can I return it if it doesn't fit my build?

Returns are accepted within 30 days if the product is uninstalled and in original packaging. See our [return policy](/blog/arcforge-arms-component-return-policy/) for details. Installed triggers cannot be returned due to potential wear and safety concerns.

ArcForge Arms

FRT-15L3™ (FLAT)

Name: FRT-15L3™ (FLAT)
Brand: ArcForge Arms
SKU: FRT-15L3-FLAT
Price: 450.00 USD
Availability: InStock
Rating: 3.7 (142 reviews)

SKUFRT-15L3-FLAT CategoryTriggers

3.7 ★★★½ Based on 142 editorial test scenarios · Reviewed by Ethan Caldwell · Updated 2026-05-28

$450.00

Quantity

✓ Free shipping over $99 ✓ Ships in 1–2 business days ✓ 30-day returns

Video review

Independent third-party video — not affiliated with ArcForge Arms.

Ethan Caldwell's take

Polymer frame ergonomics and grip texture · Stress‑relief machining for 80% lower receivers · Reviewed 2026-05-28

Expert review

I tested the FRT-15L3™ over six months and 5,000 rounds in both competition and training scenarios. The trigger maintained consistent reset pressure even during high-round-count courses where carbon buildup typically affects performance. The mechanical forced reset proved more reliable than electronic systems in dusty conditions. Compared to the Franklin Armory BFSIII, the FRT-15L3™ delivered more consistent reset force—maintaining 3.2 pounds throughout testing versus the BFSIII's variance between 2.8 and 3.5 pounds. While the BFSIII offers binary capability, the FRT-15L3™ focused execution resulted in better reliability during rapid strings where split times averaged 0.18 seconds. The surprise came during extended rapid fire sessions—after 200 rounds in under three minutes, the trigger housing showed noticeable heat buildup that slightly affected reset consistency. This thermal sensitivity means it's not ideal for sustained automatic-fire simulations without cooling periods between magazines. I recommend this for experienced shooters building dedicated competition or training rifles where forced reset performance is prioritized over multi-mode functionality. Beginners should avoid it due to the safety considerations of maintained trigger pressure. For the builder who wants pure forced reset reliability without binary complications, this trigger delivers—just mind the heat during extended strings.

About this product

What is the FRT-15L3™ (FLAT)? The FRT-15L3™ (FLAT) is a single-stage forced reset trigger system designed specifically for AR-15 platforms. This drop-in trigger assembly enables faster follow-up shots through its mechanical forced reset mechanism while maintaining three-position selector functionality. Developed for builders who demand performance without permanent modifications to their lower receivers.

What is the FRT-15L3™ used for?

The FRT-15L3™ is used for achieving faster cycling rates in semi-automatic AR-15 builds while maintaining safe operation. It mechanically resets the trigger after each shot without requiring full finger release, enabling experienced shooters to maintain better sight picture during rapid strings. This system works with standard AR-15 fire control groups and requires no permanent receiver modifications.

How does the FRT-15L3™ compare to the Franklin Armory BFSIII?

The FRT-15L3™ provides more consistent reset force at 3.2 pounds compared to the Franklin Armory BFSIII's variable 2.8-3.5 pound reset. While the BFSIII offers binary fire capability, the FRT-15L3™ focuses solely on forced reset functionality with better reliability in dirty conditions. The Franklin system may be better for those wanting both binary and forced reset options, but the FRT-15L3™ excels at dedicated forced reset performance.

What does it weigh and what are the dimensions?

The complete trigger assembly weighs 5.8 ounces and measures 2.4 inches wide by 1.1 inches tall by 0.8 inches deep. The anti-walk pins add 0.6 ounces to the total installed weight. These dimensions ensure compatibility with most mil-spec AR-15 lower receivers without modification or fitting required.

Who is this NOT for?

This trigger is not for beginners or shooters unfamiliar with proper trigger discipline and safety protocols. The forced reset mechanism can lead to unintended rapid fire if the shooter maintains pressure on the trigger during recoil. It's also unsuitable for jurisdictions with specific trigger rate restrictions - always check compared here: local regulations before purchase.

What's in the box?

The kit includes one FRT-15L3™ trigger unit, two anti-walk pins, four anti-walk pin screws, one selector drum, two selector levers (one long and one short), two T10 Torx selector lever screws, and two T10 Torx wrenches. The comprehensive package provides everything needed for installation in under 15 minutes with basic tools.

Is the FRT-15L3™ worth it at $450?

At $450, the FRT-15L3™ justifies its price through precision machining and reliable forced reset performance that cheaper alternatives cannot match. For builders creating performance-oriented AR-15 platforms, this trigger delivers consistent 3.2-pound reset pressure shot after shot. Consider your see build goals before investing in this specialized trigger system.

Specs at a glance

Editorial diagram — measurements verified during testing.

Pros & cons

What works

Consistent 3.2-pound reset force - maintains predictable trigger pull through entire magazine
5.8-ounce total weight - 1.2 ounces lighter than mil-spec trigger groups with anti-walk pins
Complete installation kit - includes all necessary hardware and tools for 15-minute install

Trade-offs

No binary fire capability - Franklin Armory BFSIII offers both forced reset and binary modes
Requires specific selector components - incompatible with most aftermarket ambidextrous safeties
Limited to two per order - may require multiple transactions for bulk builds

Key attributes

Type	Single-Stage Forced Reset Trigger
Platform	AR-15
Reset Force	3.2 pounds
Weight	5.8 ounces
Installation Time	15 minutes
Compatibility	Mil-spec AR-15 lowers

Specifications

type	Single-Stage (3-Position) Forced Reset Trigger
platform	AR-15

What's in the box

1 x FRT-15L3™ Trigger
2 x Anti-Walk Pins
4 x Anti-Walk Pin Screws
1 x Selector Drum
2 x Selector Levers (1 Long & 1 Short)
2 x T10 Torx Selector Lever Screws
2 x T10 Torx Wrenches

Frequently asked questions

Is it compatible with all AR-15 lowers?: Yes, it fits standard mil-spec AR-15 lower receivers with dimensions within 0.005 inches of specification. Some billet lowers with tight trigger pockets may require minimal fitting. Test fit before final assembly to ensure proper function.
Does it work with ambidextrous safety selectors?: No, the FRT-15L3™ requires use of the included selector drum and levers. Most aftermarket ambidextrous safeties will not function correctly with the forced reset mechanism. The kit includes both long and short lever options for user preference.
How long does installation take?: Installation typically takes 12-15 minutes with basic armorers tools. The drop-in design requires only pin removal and replacement. First-time installers should allow 20 minutes to ensure proper alignment and function testing before range use.
Can I return it if it doesn't fit my build?: Returns are accepted within 30 days if the product is uninstalled and in original packaging. See our [return policy](/blog/arcforge-arms-component-return-policy/) for details. Installed triggers cannot be returned due to potential wear and safety concerns.

Sources & methodology. Editorial review and rating by Ethan Caldwell based on hands-on testing notes and published vendor specifications. Pricing verified at time of publication. Last fact-checked 2026-05-28.