Timney Trigger AR-15 Competition - 4lb Single Stage - Mil-Spec .154"

Manufactured by Timney Triggers
SKU: 668-S
MPN: 668S
Manufactured by Timney Triggers
35 Reviews

In Stock

Standard orders will ship out within 2 business days or less. FFL orders will ship within 5 business days or less as long as we have the information for the transfer destination.



One of the easiest upgrades you can make for your AR-15 rifle is the trigger. If you are building a new rifle or just improving the Mil-Spec trigger, the Timney single stage competition trigger is a great option. This AR-15 trigger group is completely self-contained drop in unit that makes upgrading as simple as driving out the pins on your old trigger and replacing it with this fire control group. This Timney trigger gets rid of the heavy, gritty, and inconsistency of standard triggers and does so with a four-pound trigger pull. The entire line of AR-15 competition triggers have almost zero overtravel and take-up, resulting in a consistently crisp trigger break. The short rest allows you to pull the trigger extremely fast for those close quarters encounters during a 3-gun competition but is still capable for long range shots. It features a curved trigger shoe which is highly dependent on shooter preference, however, sometimes it is better to have a more traditional feel. This drop-in fire control group is a great option for those looking to improve their speed on the competition line.

  • Single-stage 4 lb trigger pull
  • Fits Mil-Spec AR-15 lower receivers with .154” pins
  • Drop-in design
  • Wire-EDM machined hammer from S7 tool steel
  • Lightweight aluminum housing
  • Heat treated to Rc 56-60 hardness
  • Curved trigger shoe
  • Lightened hammer
  • Made in the USA.

The Timney AR-15 competition trigger is wire EDM machined from heat treated S7 tool steel with an aluminum housing, so you don’t have to worry about it breaking after years of heavy use. The single-piece drop-in design is easy to install and is more reliable than standard fire control groups because it keeps dirt and debris from getting inside the mechanism. Each and every trigger is individually tested and calibrated by hand before leaving the factory floor.

This trigger group is non-adjustable to reduce the amount of parts that are potential failure points, so you can rely on it in any stressful situation. All engagement surfaces are precision ground to produce a smooth consistent pull that breaks in the same spot every time leading to greater accuracy.

Timney Triggers was founded in 1946 with the mission to bring consumers high quality, precision AR-15 and AR-10 components. They have since built a reputation that resembles this sentiment by providing triggers that are optimized for competition use by competition shooters. If you have an AR, it needs a Timney trigger.
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BrandTimney Triggers
Drop InDrop-In
ManufacturerTimney Triggers
Total Pull Weight4.0 lbs
Trigger BowCurved
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 www.p65warnings.ca.gov

Ratings & Reviews

35 reviews

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timney trigger


very good trigger works with all usa ammo inc mil spec ,easy install,fast shipping

Timney 668 AR-15 trigger


3rd Timney trigger (1st for an AR). Excellent quality, precision manufacturing, Top notch.

Timney 668-S Competition Solid AR-15 Trigger 4lb


Decided to purchase and try out this trigger system. Install was very fast, and pull and reset excellent. For those wanting an upgrade from their stock triggers I would recommend this single stage crisp pull trigger.



Easy installation. Excellent instructions. Best trigger assembly there is.

Excellent Service and Trigger


First thanks to PA for the great service - I received my order in 3 days (with the standard shipping). Next the Trigger - I am VERY happy with this. It has an excellent clean break at just under 4lbs. VERY easy installation. I had purchased a POF trigger at my LGS - it was light but had consistent creep right before break (maybe I just got a bad one). But not what I expected from a $200 trigger (returned it). Bought Timney because of the great reviews - they are justified.

Good trigger!


Good trigger! Nice doing business with Primary arms. As a gunsmith I never worry about customer service with PA.

At build


Great product delivery was quick

Timney trigger


Great service. Fast service.Trigger is the best. Breaks like a glass rod.



I did a lot of research on different triggers before I decided to buy this one. It was my first aftermarket trigger in a firearm, and I couldn't be happier. The pull is crisp, light, and easy to get consistent with. There is almost no creep, and the overall trigger pull is measured to just 2mm. I would highly recommend this to everyone as a match trigger, marksmen trigger, or overall patrol trigger. I'm in love with it.

Awesome Trigger


I replaced my AR-15 stock trigger and this should be something that all should do...