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 Trigger!!


What a great upgrade this was, this trigger is smooth and fast, super easy to install, will buy for my next build, thanks again primary arms, fast shipping, great service..



I have order from primary arms several times and have never had a bad experience. As far as the products they sell they are top quality and should anything happen to it primary arms costumer service it top notch.

Outstanding product, outstanding price


excellent price and fast delivery on a wonderful product.

Trigger Sale


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

Doesn't fit in M&P10 with ambi.


Will not work with M&P10 due to the ambi right side bolt release latch using space inside the trigger housing area. Works great in my 15.

Look no further


I have built several rifles with timneys , black rain and geiselles- all good products. Just finished an AR -10 build with the flat trigger-- incredible --- no creep, take up is minimal and it lives up to the old saying that the break should always be a surprise- I like to catch 'em on sale, but they are worth every penny. Put one on a SBR 300 BLK 8.5" and it can cycle abt 400 rpm- super fast. No other trigger from now on- super product- look no further. This is the one item that will turn a $400 slammer into a $1200 tack driver.

My new go to site for sure

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I have order from multiple site more often than I probably should but the shipping speed on my first order from PA was so fast I will always check here first. Item arrived as advertised they even gave me the sale price as it went on sale the day after my order

Best Single Stage Trigger Ever

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Had my eyes on this baby for a few weeks until the price dropped then I had to jump on it. I'm absolutely in love with this trigger, no take up, crisp break, short audible reset. What's not to love? Plus the flat blade makes it feel like a lighter pull and the notch at the bottom gives you a spot to consistently squeeze so your groupings are as good as they can be. The fact that you can literally drop this trigger in, push the provided pins in and screw them together all within a couple minutes made it an easy choice. Definitely recommend any of CMC's products, I have the curved blade in another build and it's just as amazing if you're not really into the flat blade still check out the rest of their products. You won't be disappointed and Primary Arm's shipping is by far the fastest and most customer friendly I've seen. Big double thumbs up to Primary Arms and CMC!

They'r great


Have 5 of the straight and 2 curved triggered stiles. Think I may like them? The smoothest an crisp single stag I have. Even put one in the .308 / 80% just completed.<br>Happy shooting. jp

Beautiful Trigger at a beautiful price

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Absolutely love this Trigger. Got it on Black Friday from Primary Arms for the cheapest I’ve ever seen it. Very easy to install, even if you don’t know what you’re doing. Takes about 5-10 minutes tops. I’d highly recommend CMC Triggers to anybody.