The Timney 667S-ST is a self-contained single-stage drop-in trigger with a straight shoe for small-pin (.154 in) AR-15 and M4 pattern lower receivers.
Single-stage trigger certainty with a straight shoe — the 667S-ST is Timney's modern classic for small-pin ARs.
The Timney 667S-ST drops a clean, hand-calibrated single-stage pull into small-pin (.154 in) AR-15 lowers through a straight trigger shoe. The straight profile encourages a lower finger position and a press that drives straight to the rear — mechanics that many shooters find improve their groups — while the self-contained drop-in module ensures the pull arrives exactly as Timney tested it.
No creep, minimal overtravel, positive reset: the fundamentals executed at the standard Timney has maintained since 1946, in the easiest install format the AR-15 world offers.
How It Compares
Also compare the Timney 667S Single-Stage Trigger for AR-15 Small Pin, Timney Impact AR-ST Single-Stage Drop-In Trigger for AR-15 and Timney Competition 668S Single-Stage Trigger 4 lb for AR-15 Small Pin. Browse all triggers and the full Timney Triggers range. New to this? Read our guide: AR-15 Trigger Buyer's Guide.
Ideal For
- Small-pin (.154 in) AR-15 and M4 lower receivers
- Shooters who prefer a straight shoe and a straight-to-the-rear press
- Builders who want a clean, creep-free single-stage break
- A self-contained drop-in module that fits through the existing pin holes
Key Features
- Clean single-stage break — hand-calibrated, no creep
- Straight trigger shoe — modern press mechanics
- Self-contained drop-in module — minutes to fit
- Small-pin (.154 in) fit — standard Mil-Spec lowers
Compatibility & Fitment
Drops into small-pin AR-15/M4 pattern lower receivers with .154 in trigger pins, using the existing pin holes. Large-pin receivers are not compatible, so confirm your pin size before ordering. Function-check the rifle before live fire.
Technical Specifications
Platform | AR-15 / M4 |
Fits | Small-pin (.154 in) AR-15 / M4 lower receivers |
Type | Single-stage drop-in trigger, straight shoe |
Made in | USA |
Brand | Timney Triggers |
US Shipping & Support
Shipped from D&R Sports Center in the USA with fast, tracked delivery. Questions on fit, mounting or which model suits your setup? Our team is glad to help before and after your purchase.
Frequently Asked Questions
What do I need to check before ordering the 667S-ST?
It's a drop-in single-stage unit for AR-15/M4 pattern lowers built with small .154 in trigger pins. Large-pin receivers won't accept it, so confirm your pin size first. If your receiver's specification isn't clear, contact us with the make and model and we'll help you check.
What kind of shooting is a single-stage AR trigger best for?
A single-stage has no take-up stage: you press and it breaks at one point, which many shooters find quicker and simpler under time pressure. This is the straight-shoe 667S-ST from Timney's AR line, supplied as a self-contained drop-in unit and made in the USA. Timney does not list a published pull weight for this model, so ask us if you need the figure.
Why the straight shoe on this version?
A flat, straight bow means your finger meets the trigger in the same place whatever your grip depth, which helps consistency across positions. The curved shoe 667S is the same trigger with a traditional bow if you prefer that feel. Both are small-pin parts, so the pin check applies either way.
Do I need anything else with it?
No, it uses the trigger and hammer pins already in the receiver, and nothing further has to be bought. Installation is ordinary trigger group replacement followed by a careful function check.
