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

Out of Stock



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
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

Excellent trigger


Excellent trigger. Absolutely zero take up, when the trigger moves, the hammer falls. Smooth pull all the way through and a nice reset. Will be putting this trigger in all of my builds.

Solid for me


Have this flat trigger on several AR's. Almost 3 years worth of use with no issues as of yet. Recommend reputable anti walk pins be used on install and you'll shouldn't have any problems.

Installed on DPMS AR15

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Installed on a DPMS AR15. Easy installation and without a doubt the best upgrade I've done to my rifle. Very crisp/clean break, completely different from the stock trigger which was like squeezing a sponge. This CMI trigger is like squeezing a hard rubber ball. Very happy with the purchase. They shipped Monday it arrived Wednesday morning USPS. Thank you PA for making this upgrade affordable!

Love It!

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I absolutely love this trigger. World of difference over the mil spec one. I installed it in my long range AR in about 10 minutes and used blue Loctite on the screws. The pull actually measured at 2.5 pounds, but that is even better for me. I was hitting steel at 600 yards with no problem with my Leupold Patrol. The trigger pull is nice and clean and I like the flat one better than my curved triggers. It also looks way cool. I bought it on sale at PA and shipping was fast, as always. I hate waiting for some of the others to deliver. PA is definitely my go-to for parts and accessories.

CMC Trigger

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If I am being completely honest I had some issues with the first trigger I bought. It had issues resseting. I contacted CMC and they handled it no questions asked. The second trigger is still running strong years later.

Great Drop In

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Fantastic Drop In. Two 3.5's, a 2/2... zero problems, light pull, short reset, easy install, pins included. A reputable company. Flat bow gives (feels) the illusion of an even lighter trigger pull. Light on the wallet when on sale. PA folks always friendly (not easy to do always. everyones got problems), great customer care. I'd recommend and buy again.

CMC drop in trigger

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I ordered this trigger a few weeks ago. Installed it in my wife's AR 15 chambered in 6.8 SPC. She loves it and wants me to order one for her 300 Blackout.
<br>Perfect fit with no issues (about 5 minutes to install it).
<br>I will buy another one soon. PA shipping is always fast.

The best, bar none

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CMC Triggers, without a doubt, makes the best aftermarket trigger for the AR platform. When you factor in price, performance, ease of installation, and of course the beautiful light and crisp pull, there's nothing that even compares. I've got one of these in 3 different rifles, the oldest of which has ignited more than 5000 rounds, and it's still as crisp and perfect as the day that I dropped it in. There's no justifiable reason to not own a CMC Trigger group if you own an AR.

Great trigger

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Installed this trigger in my first AR15 build which is in a pistol setup. This trigger is the best feeling trigger I have used on an AR15. Great quality and with over 800 rounds on mine, not one mishap. Crisp operation every time. I will buy again!

Best trigger out there for the price.

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I have 2 of these now and a couple other drop in brands. Honestly for the money there isn't a better drop in trigger out there. I love the straight trigger and the clean break and minimal takeup. Easy to install and reliable. My go to trigger for any build.