Timney Triggers AR-15 Competition Skeletonized 4lb Single Stage Trigger

Manufactured by Timney Triggers
SKU: 664S
MPN: 664S
Manufactured by Timney Triggers
1 Review

In Stock

Standard orders will ship out 2 business days if ordered by 3:30 pm CST, Monday-Friday. FFL orders will ship within 5 business days or less as long as we have the information for the transfer destination.



If you are going to build an AR-15 from the ground up, why settle on a heavy, gritty, Mil-Spec trigger? The Timney Competition AR-15 trigger comes from the factory with a hand tuned 4 pound trigger pull, so you don't have to adjust it yourself. The drop-in design makes it extremely fast and easy to install, so you can get to the range as fast as possible. The solid, curved design of the trigger shoe is a great option for target shooting or competition use, however, it is mostly preference. If you prefer the feel of a traditional curved trigger than this one is for you. It also has a skeletonized design that will give your rifle a unique look compared to the competition. Additionally, the reset is very short, so you can shoot much faster than standard Mil-Spec triggers which is important when you are trying to get the fastest time possible. This drop in fire control group is a great option for those looking to improve their speed and accuracy with their competition AR-15 rifle.

  • 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 and skeletonized 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 AR-15 single stage trigger group is non-adjustable to reduce the amount of parts that are potential failure points, so you can rely on it in any 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. Not only is this trigger a good choice for competition, but it is great for general target shooting and trying to get the smallest groups.

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
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

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Great 4lb Drop In Skeltonized Trigger


I purchased this timney trigger when building my latest Aero M4E1/Midwest Ind/Radian/Magpul build. Personally I like my Ar15 trigger to have a little resistance and I typically like to stay around 4lbs. The build of this trigger group is well machined and built. I tested the trigger pull multiple times with my digital trigger pull gauge and I think the avg is around 3.75lbs. Crisp break and theres almost no re-set. I bought this on sale for $179 and really only go it because of the price and because the skeltonized trigger goes good with my other skeltonized parts like extended mag & bolt releases. The only issue I had and this may be the fault of my Aero lower but this trigger group because of how it and the lower are shaped almost didn't fit. The back hole was slightly off because it couldn't slide fully forward and it made installing the back trigger pin tight. I ended up taping the pin in with my ballpeen hammer but any tougher a install and I probably would've sent it back.