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The Timney AR-15 Skeletonized Drop-In Trigger #664S takes the guesswork out of upgrading your fire control group. It ships as a fully assembled cassette that's already been hand-calibrated to a 4 lb pull, so there's no staking, filing, or tuning to worry about. You pull your old fire control parts, drop this module into a small-pin lower, reuse your original hammer and trigger pins, and you're back in business. Timney's design keeps the internals captive in a lightweight aluminum housing and helps guard against pin rotation and walkout, which is a common headache with loose mil-spec setups.
The difference between this and a factory trigger is the kind of thing you notice on the very first press. It's a single-stage with a smooth take-up and a crisp, creep-free break that resets short and clean. A lot of folks describe the feel as closer to a good bolt-action rifle than a typical carbine trigger, and that translates directly into tighter groups when you're shooting off a bag or ringing steel at distance. The 4 lb weight is a sweet spot too, light enough for precision work but still with enough resistance for general-purpose and defensive use.
This isn't a trigger that wears out on you. The hammer is wire-EDM machined from S7 tool steel for impact resistance, while the other working parts are cut from A2 tool steel and heat-treated for a long service life. Engagement surfaces are precision ground, which is a big part of why the break stays consistent shot after shot. Timney has been building triggers in the USA since 1946 and backs these with a lifetime warranty, so it's a buy-once-cry-once kind of part.
This is the small-pin (.154 inch) version, so make sure your lower matches before ordering. It's built for 5.56/.223 AR-15 platforms. If you're running a polymer lower, Timney suggests slipping a thin aluminum shim under the module to protect the receiver. Installation is quick with basic hand tools, and since the pins are already out, it's a good time to consider an anti-walk pin set if you want extra insurance.
This is the small-pin version, built around the standard .154 inch pin size found on most mil-spec AR-15 lowers. It's designed for 5.56/.223 platforms. If your lower uses large pins, you'll want the large-pin equivalent instead, so double-check your receiver before ordering.
No, the #664S is factory preset and calibrated by hand to 4 lb, and it's non-adjustable. That's part of what makes it a true drop-in unit with no tuning needed. If you want a lighter or heavier break, Timney offers the same skeletonized design in 3 lb and 4.5 lb versions.
Anti-walk pins aren't required since the module's design already helps resist pin rotation and walkout using your rifle's original pins. That said, plenty of builders add an anti-walk pin set for extra peace of mind since the pins are already out during install. It's an easy add if you want the belt-and-suspenders approach.
Yes, but Timney recommends placing a thin piece of aluminum under the module to protect the polymer receiver from the trigger housing. This helps prevent any wear or flex over time. For metal lowers, no shim is needed.
| UPC | 081950664191 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 664S |
| Shipping Weight | 0.2 |
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