The Timney Skeletonised 661S is a single-stage drop-in trigger for small-pin (.154 in) AR-15 and M4 pattern lower receivers.
A trigger that looks as sharp as it breaks — the skeletonised 661S cuts weight and adds presence without touching reliability.
The Timney Skeletonised 661S drops a 3 lb (1.4 kg) single-stage pull into small-pin (.154 in) AR-15 lowers through a distinctive skeletonised shoe — machined-out styling that trims mass and gives a build genuine bench presence. Behind the looks sits standard Timney discipline: a hand-calibrated break with no creep, minimal overtravel and a positive reset, delivered in a self-contained drop-in module.
Three pounds is the versatile sweet spot — light enough for precise deliberate work, sensible enough for practical shooting — making the 661S as functional as it is photogenic.
Why shooters choose the 661S
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3 lb (1.4 kg) hand-calibrated break — the versatile match weight
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Skeletonised shoe — distinctive style, reduced mass
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Self-contained drop-in module — minutes to install
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Small-pin (.154 in) fit — standard Mil-Spec lowers
What the 661S fits
Drops into small-pin AR-15/M4 pattern lower receivers with .154 in trigger pins, via the existing pin holes — including UK straight-pull AR-15 builds, where the 3 lb (1.4 kg) break sits at a sensible weight for range and target work. Large-pin receivers are not compatible, so confirm your pin size before ordering. Function-check the rifle before live fire.
Specifications
| Platform |
AR-15 / M4 |
| Fits |
Small-pin (.154 in) AR-15 / M4 lower receivers |
| Type |
Single-stage drop-in trigger, skeletonised shoe |
| Pull weight |
3 lb (1.4 kg) |
| Made in |
USA |
| Brand |
Timney Triggers |
| MPN |
661S |
Function with flair. Order the Skeletonised 661S today — in stock at Xtreme Tactical Gun Parts with £5 tracked UK delivery in 7–10 business days.
Explore more: all Rifle Triggers, AR-15 Parts & Accessories or browse all Timney Triggers.
