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Swap out that gritty, creepy factory trigger and your AR-15 turns into a whole different rifle. The Timney 661S is a cassette-style module that arrives fully assembled, so there's no stacking springs, fitting parts, or fiddling with adjustments at the bench. Timney hand-assembles, tests, and calibrates every unit at a factory-set 3 pound pull, which lands in the sweet spot for precision work and competition without feeling twitchy at the range.
The internals are built to take a beating. The hammer is wire-EDM machined from S7 tool steel, prized for its impact resistance, while the sear and other engagement parts are cut from A2 tool steel and heat treated for the long haul. All of that sits captive inside a lightweight aluminum-alloy housing, so the whole group stays self-contained and consistent shot after shot. The single-stage break is smooth and creep-free with that clean, glass-rod snap Timney is known for.
Installation reuses your rifle's original hammer and trigger pins, and Timney's design uses tension screws at the base of the housing to lock everything down. That setup fights pin rotation and walkout without needing separate anti-walk pins. Plan on around 15 minutes if you're comfortable pulling your old trigger, a bit longer if it's your first go. One thing worth knowing up front: this module is built for small-pin (.156-inch) mil-spec lowers, so if you're running an off-brand or 80-percent completed lower, double-check your pin spacing before ordering.
The skeletonized, curved shoe finishes the package with a distinctive Black/Gold look and a familiar finger position. For anyone chasing tighter groups on a precision or 3-gun build, this is one of the most straightforward upgrades you can make, and it's backed by Timney's lifetime warranty.
This module is made for small-pin (.156-inch) mil-spec AR-15 lowers chambered in .223/5.56, which covers the vast majority of modern rifles. It reuses your existing hammer and trigger pins, so no special pins are needed. It is not built for .308/7.62 AR-10 platforms or the large-pin Colt receivers from the 90s, so match the pin spec on your lower before ordering.
No. Timney's design uses tension screws at the base of the housing to press the group against your standard pins, which keeps them from rotating or walking out. A lot of folks add anti-walk pins anyway since the pins are already out during install, but a properly installed 661S holds fine on its own.
It's about as simple as trigger upgrades get. Because it's a self-contained cassette, there's no stacking loose springs or pins. Most people knock it out in around 15 minutes with basic tools; the only fussy step is seating the second set of tension screws over the spring tails, so take your time there.
It isn't. The 661S comes calibrated by hand at the factory to a crisp 3 pound single-stage break and stays there. If you want a heavier option, Timney offers the same Competition Trigger in 4 lb and 4.5 lb weights.
| UPC | 081950661237 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 661S |
| Color | Black |
| Length | 7.1500 |
| Model | |
| Product Type | Trigger |
| Style | Non-Adjustable |
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