Description
CMC has been building drop-in triggers for the AR platform since 2003, and this flat single-stage group is the one that put them on the map. It arrives as a totally self-contained, one-piece assembly that drops right into any mil-spec AR-15 or AR-10 lower with small pin (.154 inch) holes. No shims, no springs to fiddle with, no gunsmith required. You knock out your old trigger, set this one in, tap in the supplied pins, and you're running.
What you feel on the range is a clean 3 to 3.5 pound pull with almost no take-up and a break that folks like to describe as glass-smooth. There's no grit and no creep sneaking up before the hammer drops, which makes it a lot easier to call your shots and tighten up your groups. The reset is short and positive, so follow-up shots come quick whether you're ringing steel or working a stage.
Why the CMC Flat Trigger Bow Works
The flat shoe is the star here. It gives your finger more surface area and a straight-down pull, so your pad lands in the same spot every single time and the leverage stays consistent. That repeatability is a big part of why this pattern is so popular with precision and competition builds. It also just feels good under the finger once you're used to it.
Built to Hold Up in the CMC Single-Stage Trigger
The internals are machined from 8620 alloy steel and S7 tool steel to tolerances of plus or minus .001 inch, and CMC's sear engagement surfaces get a proprietary finishing process that leaves them far smoother than typical EDM-cut parts. A high-power rocket wire hammer spring keeps lock time short and ignition reliable with both commercial and surplus ammo. Every unit is hand assembled, hand tested, and factory pre-set at the shop before it ships, so the pull weight is dialed in and not user adjustable. If you've been running a gritty mil-spec trigger and want a real upgrade that installs over lunch, this is a proven pick.
Key Specifications
- Manufacturer: CMC Triggers
- MPN: 91503
- UPC: 850544004022
- Model: Drop-In
- Action Type: Single-Stage
- Trigger Bow Style: Flat
- Pull Weight: 3-3.5 lb (factory pre-set, non-adjustable)
- Pin Size: Small Pin (.154 in)
- Fits: Mil-spec AR-15, AR-10, LR-308
- Housing: 410 Stainless Steel
- Internal Material: 8620 Alloy Steel and S7 Tool Steel
- Machined Tolerance: +/- .001 in
- Finish: Black/Silver
- Length: 7.3 in
- Units Per Box: 1
What’s Included
- CMC drop-in flat single-stage trigger assembly
- CMC Anti-Walk Pin Set
Frequently Asked Questions
Will the CMC flat single-stage trigger fit my rifle?
It's built for mil-spec AR-15, AR-10, and LR-308 lowers that use small pin holes measuring .154 inch for the trigger and hammer. If your lower takes standard small pins, you're good to go. Large pin receivers will need a different model.
Is this trigger hard to install?
Not at all. The whole thing is a self-contained one-piece unit, so you drop it into the lower and tap in the supplied pins with no gunsmithing needed. Most folks have it done in just a few minutes, and a little gun oil on the anti-walk pins makes seating them easier, especially on coated lowers.
Can I adjust the pull weight on the CMC single-stage trigger?
No, this one comes factory pre-set at 3 to 3.5 pounds and is not user adjustable. CMC hand assembles and hand tests each unit so the pull is dialed in right out of the box. If you want a different weight, CMC offers this same flat bow in heavier pull ranges.
What makes the flat bow different from a curved trigger?
The flat shoe gives your finger a bigger, straighter contact surface, so your finger pad lands in the same place shot after shot. That consistency helps with leverage and repeatability, which is why the flat pattern is a favorite on precision and competition builds. It comes down to preference, but a lot of shooters won't go back once they try it.






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