Timney Skeletonised Trigger 661S - AR-15 Small Pin - Single-Stage 3 lb

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

• 3 lb (1.4 kg) hand-calibrated break — the versatile match weight
• Skeletonised shoe — distinctive style, reduced mass
• Self-contained drop-in module — minutes to install
• 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

Function with flair. Order the Skeletonised 661S today — in stock at Xtreme Tactical Gun Parts with free tracked UK delivery in 7–10 days.

Explore more: all Rifle Triggers, AR-15 Parts & Accessories or browse all Timney Triggers.