The Timney 667S is a self-contained single-stage drop-in trigger with a curved shoe for small-pin (.154 in) AR-15 and M4 pattern lower receivers.
Timney's modern classic single-stage trigger — the 667S pairs a hand-calibrated break with the curve traditional shooters trust.
The Timney 667S drops a clean, consistent single-stage pull into small-pin (.154 in) AR-15 lowers through a traditional curved shoe. The curve cradles the finger pad and gives instinctive tactile position — the feel generations of riflemen trained on — while the internals deliver Timney's signature: no creep, minimal overtravel, and a reset you feel without hunting for it.
Delivered as a self-contained drop-in module, the 667S installs through your existing pin holes in minutes and arrives exactly as it was calibrated — the same simple promise Timney has kept since 1946.
How It Compares
Also compare the Timney 667S-ST Single-Stage Trigger for AR-15 Small Pin, Timney Impact AR 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 traditional curved shoe and instinctive finger placement
- Builders who want a hand-calibrated single-stage break in a self-contained module
- Installs through the existing pin holes in minutes
Key Features
- Hand-calibrated single-stage break — clean and consistent
- Traditional curved shoe — instinctive finger placement
- Self-contained drop-in module — the easiest install format
- 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, curved 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
Will the 667S fit my lower receiver?
It drops into AR-15 and M4 pattern lowers that use small .154 in trigger pins, which is the common mil-spec size. Large-pin receivers will not accept it, so confirm your pin size before ordering rather than after. If you are not sure, the lower's manufacturer will be able to tell you.
What sort of trigger pull does it give?
It is a self-contained single-stage drop-in, so the pull is one continuous movement to a clean break with none of the grit you get from a stock mil-spec trigger. Being a sealed unit, the internals stay in alignment rather than depending on how well your pins and springs are seated. It is a sensible general-purpose upgrade rather than a dedicated match trigger.
Curved or straight shoe — which should I pick?
This is the curved-shoe version, which matches the shape most AR shooters already have muscle memory for. The 667S-ST straight shoe is the same trigger with a flat bow, which gives a consistent contact point and a slightly different feel at the bottom of the face. If you shoot with your finger high on the trigger, the curve usually feels more natural.
What do I need to install it?
A punch and hammer to drive the trigger pins out and back in is normally the extent of it, plus any anti-rotation hardware supplied with the unit. Once in, do a full function check before the rifle is used.
