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If you've ever felt your AR-10 was capable of tighter groups than you were shooting, the trigger is usually the culprit. The Timney 670ST Competition Trigger swaps out that gritty, slack-heavy factory setup for a single-stage break that's clean and predictable every single time. It arrives as a fully self-contained cassette, so there's no gunsmithing, fitting, or spring-juggling on the workbench. Drop it in, push through your existing hammer and trigger pins, and you're set.
This trigger is factory tuned to break right at 4 pounds with no creep, which is a sweet spot for precision work without going so light it feels twitchy on a big rifle. The straight trigger shoe gives you a consistent finger placement and a flatter pull that a lot of competition and long-range folks prefer. Every unit is precision machined and then tested and calibrated by hand before it leaves the shop, so what you get is a trigger that's already dialed in rather than something you have to tinker with.
Timney doesn't cut corners on materials here. The hammer is wire-EDM machined from S7 tool steel and coated for a smooth, slick release, while the internals ride in a lightweight 6061 T6 aluminum housing that's anodized for durability. The AR-10 version runs a heavier hammer than the AR-15 units on purpose, since the larger, harder primers on .308 and 7.62×51 need a firmer strike for reliable ignition. That's the kind of detail that keeps you from chasing light primer hits down the road.
This is the small-pin model, meaning it's built for standard .154-inch trigger and hammer pin holes, which covers the vast majority of AR-10 pattern lowers out there. It's designed for the .308 and 7.62 platform specifically, so it's the right call over an AR-15 trigger for these rifles. Timney backs it with their lifetime warranty, and it's made right here in the USA.
It's built for small-pin lowers using the standard .154-inch trigger and hammer pin holes, which is what most AR-10 pattern receivers use. It reuses your rifle's existing hammer and trigger pins, so nothing extra is needed for a standard mil-spec lower. If you have an 80 percent completed or off-brand lower, it's worth measuring your pin holes first to be sure everything lines up cleanly.
No. The 670ST is a fully self-contained drop-in cassette, so it goes in without any fitting, filing, or adjustment. Most people have it installed in just a few minutes with basic tools, and there's nothing to tune since it comes calibrated from the factory.
You'll want the AR-10 specific unit like this one. Timney builds the AR-10 trigger with a heavier hammer to reliably ignite the larger, harder primers found in .308 Winchester and 7.62×51 ammo. An AR-15 trigger can lead to light primer strikes and misfires in these rifles, so matching the trigger to the platform matters.
The 670ST is set at the factory to break right at 4 pounds and is not user-adjustable. That weight is a solid all-around choice for precision and competition shooting without being so light it feels unpredictable on a larger caliber rifle. Every trigger is hand-tested to that spec before it ships.
| UPC | 081950670178 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 670ST |
| Color | TRIGGER |
| Length | 7.0500 |
| Model | |
| Product Type | Trigger |
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