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
76 Reviews

In Stock

Standard orders will ship out same day if ordered by 3:30pm CST. FFL orders will ship within 5 business days or less as long as we have the information for the transfer destination.



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
ManufacturerCMC Triggers
Total Pull Weight3.5 lbs
Trigger BowFlat
Trigger Pin DiameterMIL-SPEC .154
Trigger StyleSingle Stage

WARNING: This Product can expose you to chemicals which is known to state of california to cause Cancer and Reproductive Harm. For more information, see

CMC AR-15 Trigger


The installation was very easy. I really like the flat trigger. The pull weight averages 3.4 LBS which is a great improvement over the stock milspec pull of just over 8 LBS. I would recommend this trigger. Other than the shipping, which I feel was a bit high for such a small item, I am happy with my purchase.

CMC Trigger


The only way to beat a CMC Tactical Drop-In Trigger is to offer it at a good price and have quick shipping. Well done CMC and Primary Arms.

Simplicity and sexy


This CMC trigger is just spot on the best bang for your buck!! It's got a great warranty, it's 100% drop-in ready, and most importantly it functions like a 300$ trigger. No creep, the reset is just insanel on this thing. Try it, you will not regret it. Thank you to Primary Arms for having it at the best price and of course shipping to my house as if I live next door. You guys Rock!!

CMC Drop In


This is my 7th CMC trigger purchase. Not one complaint or failure yet. My first one has over 5000 rounds through it, has been dropped in the snow, dirt and mud. I have since recommended to many family and friends. I can also tell you I have put over 20 of these triggers into guns I've built and still yet to hear a complaint. Just a fantastic American made product from a Texas Company with an outstanding price tag that won't burn a hole in your wallet.

love cmc


this is my favorite trigger to date. the take up, the break, and the reset are all spot on. can't say enough good things about PA and CMC both.

Great product ,price and service


this is my third cmc tactical trigger from primary arms. They all work flawlessly and are great triggers ( break real clean) P/A has the best sale price and great shipping as well.

Nice quality trigger group


This trigger drops in quick and super easy. Night and day compared to the standard mil spec kit. Currently in my gas piston pistol working with no problems.



Very good fit. I love the way the pins secure with screws.



What a difference when you have a nice trigger. Exceptional feel! Great too, how it simply slips into place as a unit.

CMC trigger


What a difference. nice clean trigger pull with no creep. Last thing I needed for my tack driving 20" AR. And of course PA had the thing in the mail less than 24 hours after I ordered it :-)