CMC Triggers AR-15 Drop In Single Stage Trigger - Flat - 3.5 lbs

Manufactured by CMC Triggers
SKU: 91503
MPN: 91503
Manufactured by CMC Triggers
78 Reviews
Add to cart for sale price $139.99 $174.00

In Stock

Orders of non-FFL items will ship same-day if placed before 3:30pm CST (M-F). FFL orders will ship within 5 business days if transfer details are provided.

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The CMC Single Stage trigger features a non-adjustable flat trigger bow with a 3.5lb pull that breaks like glass. It has almost no take-up and extremely short reset to make follow up shots fast and easy. The flat trigger increases the surface area that your finger rests on giving you increased control and leverage when pulling the trigger. The hammer is lightened and uses a high-power Rocket Wire spring that ensures reliability with commercial and surplus ammunition. The high-power spring also results in minimal lock time, which is the time it takes for the hammer to fall and strike the primer, resulting in much more accurate shots. CMC Triggers have invested in a new production and tooling setup that incorporates advanced techniques that help to reduce manufacture time and cost while still providing you with a high quality, reliable trigger that is affordable.

  • Compatible with AR-15 and AR-10 rifles
  • Installs with Mil-Spec .154” trigger pins
  • Single stage 3.5lb trigger pull
  • Non-adjustable flat trigger bow for improved trigger control
  • Tactile and short reset
  • Minimal lock time with lightened hammer and full power Rocket Wire spring
  • Drop-in, one-piece design made from 8620 alloy steel
  • Includes anti-walk pins
  • 100% Manufacturers Lifetime Warranty!

Note: Trigger pull weights are approximate and may vary between rifles

Assembling an AR-15 for the most part is pretty simple; however, some aspects of the process can be frustrating such as installing the takedown detent and spring or trying to put the trigger together. CMC Triggers saw a need to improve on the AR15 trigger installation process and introduced their line of completely self-contained trigger groups. Each trigger is encased in 8620 alloy steel to protect the internal components from dirt and debris, carbon buildup, or anything else that might get into the lower receiver and can be installed in seconds. Just drop it in, install the Mil-Spec trigger pins and you are ready to go. They have a huge selection of triggers that are built for specific applications and preferences. This model is designed for target shooting, home defense, and hunting as it has a light trigger pull to improve accuracy without sacrificing reliability or safety. Install this fire control group today and experience a smooth trigger pull like never before.

With roots in aerospace manufacturing, CMC is perhaps best known as the producer of the original drop-in precision trigger for the AR-15/10 platform. CMC Triggers are dedicated to crafting the finest parts and accessories for law enforcement, military, and civilian use.
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BrandCMC Triggers
Drop InDrop-In
Manufacturer.CMC Triggers
Trigger BowFlat
TypeSingle Stage
Weight6.4 Oz
California Prop 65 warning

 WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information go to

Ratings & Reviews

78 reviews


CMC Trigger


As always great service, price and shipped immediately. Will continue to support and recommend.

CMC - The absolute best


Bought my first CMC 3.5LB flat trigger a while back. Since I made the change, I have installed 4 more and now have one on every rifle I own. You just can't beat the feel of this trigger. Excellent buy. Buy with confidence.

CMC finess


Bought the trigger on good word from other shooters, and I was definitely pleased. Great product from CMC, and of course. Always great service from Primary Arms. Only thing I can complain about is the fit I got from the supplied pins. Not to mention that I had on of the heads break from the screws. All in all. A great trigger.

CMC Trigger


Excellent price and service. Top notch Texas company.

Great Item


Fantastic Purchase. This CMC Tactical Drop-in Trigger is great. Put it in my DDM4-v7 and it is a 100% improvement. No slack and so crisp it takes no effort to fire. The shipment was received 2 days after ordering and it was well packaged. Thanks guys.

Go easy with the retaining pin


Go easy when tightening the hex screw on the retaining pin. The trigger housing is held in place with retaining pins that are secured with hex head screws on both sides of the receiver. They conveniently give you two small hex wrenches to use as well. I tightened it a little too hard and ripped the head right off while leaving the threads one the retaining pin. Called Primary Arms and they got me in contact with CNC. They sent me a whole new retaining pin set for free. Called Fri, got pins on Tuesday. Trigger is very nice. Smooth, super short uptake, crisp break. Very nice. Thanks PrImary Arms and CNC

Trigger Sale


great product, great service, same as always 2 thumbs up

Very good trigger -


Have to get used to it - I have other 4# triggers but this one has zero uptake and pop - got this cartridge style to help me 'fix' an 80% that I measured once and cut twice... and so far so good! Covers my miscalculation...

Awesome service


I ended up going to the store to pick up my order and every one there was very friendly and very helpful! I ended up getting a few more things while I was there. I will going back for sure.

What a fantastic upgrade to my rifles


I got 3 of these to go in my rifles and I am extremely pleased..easy to install and to remove for cleaning via the supplied take down pins.Plus....I really like the feel of the straight trigger pull levers on these triggers!!!!!