RISE Armament “Don’t Tread on Me” RA-140 Flat Trigger – Single-Stage, 3.5 lb Pull
AR-15/AR-10 Compatible • Drop-In Trigger Module • Flat Shoe • Gadsden Flag (“Don’t Tread on Me”) Finish
Model: RA140FDTOM • UPC: 853742008922
Turn your AR into a precision machine—while giving it a bold patriotic look. The RISE Armament Don’t Tread on Me RA-140 Flat Trigger is a single-stage, drop-in trigger tuned to a clean 3.5-lb draw weight and finished with the iconic Gadsden “Don’t Tread on Me” flag. Built for shooters who demand zero creep, a glass-rod break, and a lightning-fast reset, this flat-faced upgrade transforms gritty mil-spec pulls into crisp, confidence-building trigger presses for the range, competition, hunting, and well-trained defensive use.
If you prefer the consistent finger placement and leverage of a flat shoe, the RA-140 FDTOM is your sweet spot—straight-to-the-rear press, shorter perceived pull, and superb shot-to-shot consistency.
Why Choose the RA-140 “Don’t Tread on Me” Flat Trigger
True Single-Stage Performance
No stacking. No spongy take-up. A repeatable ~3.5-lb break and short, tactile reset keep splits quick and sights steady.
Flat Trigger Shoe Advantage
The flat bow encourages consistent finger indexing across different hand sizes, promotes a straight rearward press, and can feel like a lighter, more controllable pull.
Drop-In Simplicity
Arrives as a self-contained cassette for fast installation in most AR lowers that use standard 0.154" pins—no polishing, spring mix-ups, or guesswork.*
“Don’t Tread on Me” Flag Finish
Durable special-edition finish adds patriotic flair to your lower without compromising duty-ready durability.
Precision-Built Internals
Tight tolerances and quality components deliver reliability and longevity through heavy round counts.
*See compatibility notes below for receivers and pin sizes.
Key Features & Specs
Type: Single-stage drop-in trigger assembly
Pull Weight: ~3.5 lb (factory set)
Trigger Shoe: Flat
Reset: Short, positive, audible/tactile
Finish: “Don’t Tread on Me” Gadsden flag motif
Pin Size: Small pin 0.154" (standard AR)
Platform: AR-15 / AR-10 / LR-308 pattern lowers (mil-spec)
Model: RA140FDTOM
UPC: 853742008922
Not compatible with large-pin (.170") Colt-pattern receivers. Some billet or proprietary lowers may require anti-walk/anti-rotation pins for best fit.
Performance You’ll Notice
Faster Follow-Up Shots
A short, authoritative reset makes it easy to ride the wall and send accurate second shots without over-travel.
Cleaner Break = Tighter Groups
Eliminating gritty creep reduces disturbance at the shot, helping tighten groups at 100–600 yards and beyond.
Consistency Under Pressure
The flat shoe’s consistent pad placement supports predictable timing during movement, offhand, and positional stages.
Ideal Use Cases
3-Gun & Practical Competition: Maximize speed and accountability with a crisp break and fast reset.
Precision & Rec Carbines: Immediate feel upgrade over mil-spec FCGs for better practical accuracy.
Hunting: Controlled, clean release for ethical shot placement.
Defensive Training Builds: Repeatable pull weight that supports training carryover and confidence.
Installation (General Guidance)
Unload & Clear: Remove magazine, lock bolt, and inspect chamber.
Remove Old FCG: Drift out hammer/trigger pins; capture springs and disconnector.
Seat the RA-140 Cassette: Drop into the fire-control pocket and align pin holes.
Install Pins: Use standard 0.154" pins or anti-walk pins per preference.
Function Check: Perform Safe → Fire → Reset checks; confirm positive safety engagement and proper disconnector function.
Range Verify: Confirm reliability & point of impact with your chosen ammo.
If you’re new to AR fire-control work, a qualified gunsmith/armorer can ensure correct sear engagement and safety operation.
Compatibility Notes
Receivers: Designed for mil-spec small-pin (0.154") AR lowers (AR-15/AR-10/LR-308).
BCGs & Safeties: Works with standard carriers and selectors; verify no interference and solid safety lockup.
Pins: Hard-use rifles often benefit from anti-rotation pins (sold separately).
Maintenance & Care
Apply a light film of quality oil at pivot/friction points.
Do not stone or modify sear/hammer surfaces—this can compromise safety and void warranties.
Periodically check pin security and function after high-round weekends or classes.
Frequently Asked Questions
Q: What’s the pull weight?
A: Approximately 3.5 pounds, factory-tuned for a crisp break and quick reset.
Q: Flat vs. curved—why choose flat?
A: A flat bow offers consistent finger placement and leverage, often yielding a shorter perceived pull and improved control.
Q: Will it fit my AR-10?
A: Yes—if your lower follows small-pin 0.154" specs. Check your manufacturer if your receiver is proprietary.
Q: Do I need anti-walk pins?
A: Not required, but recommended for hard-use rifles and some billet lowers.
Q: Is 3.5 lb suitable for defensive use?
A: Many trained shooters prefer it. Always verify safe operation, conduct thorough function checks, and train accordingly.
SEO Highlights (Quick Scan)
RISE Armament RA-140 Don’t Tread on Me flat trigger
Single-stage, 3.5-lb pull, drop-in AR trigger
Flat trigger shoe for consistent finger placement & control
Fits AR-15/AR-10 (0.154" pins); Gadsden flag finish
Model RA140FDTOM, UPC 853742008922
The Bottom Line
The RISE Armament RA-140 FDTOM blends a crisp single-stage 3.5-lb break, a fast reset, and the control-oriented flat shoe with a distinctive Don’t Tread on Me finish. It’s a drop-in, duty-tough upgrade that instantly elevates your AR’s shootability—faster splits, tighter groups, and rock-solid consistency without the hassle of tuning spring kits.
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