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Timney built the 681-ST specifically for the pistol-caliber carbine crowd, and it shows. This is a fully self-contained, drop-in assembly that arrives factory-tuned for a crisp 2.5 to 3 pound pull with no creep to work through. If you have ever wrestled with the mushy, inconsistent break of a stock PCC trigger, this is the kind of upgrade that changes how the whole gun feels the first time you press it.
The internals are where the quality lives. The trigger, hammer, and bridge are machined from heat-treated steel, and the housing is 6061 T6 anodized alloy, so the whole unit is built to take a beating. That hardened steel bridge protects the trigger components from the heavier, faster hammer strikes that blowback pistol-caliber guns are known for, which is exactly why a dedicated PCC trigger matters instead of running a standard rifle unit. It comes with a straight trigger shoe, giving you that flat, repeatable finger placement a lot of competition folks prefer for fast, controlled follow-up shots.
Installation is genuinely simple. Pull your factory trigger, drop this one in, and reuse your existing hammer and trigger pins along with your original safety selector. Set screws in the housing lock everything in place and keep your pins from walking loose over a long range session. No gunsmith, no fitting, no fussing with springs or adjustments.
Pistol-caliber carbines have exploded in popularity thanks to competition divisions in USPSA and IDPA, plus their appeal for training and home defense. A clean, predictable trigger is one of the single biggest upgrades you can make to a PCC, and Timney has spent decades setting the bar for aftermarket AR triggers. The pull weight is preset at the factory and not adjustable, which keeps things dead consistent shot after shot. If you want your 9mm, .40, or .45 carbine to shoot like it means it, this is a straightforward way to get there.
No. The 681-ST is a complete, self-contained drop-in unit that installs without any gunsmithing, fitting, or adjustment. You remove your factory trigger, drop this one in, and reuse your existing hammer and trigger pins. Set screws in the housing lock it in place and keep the pins from walking loose.
Yes. The Timney PCC trigger is designed to run with your rifle's original safety selector, and it also plays nicely with many aftermarket replacements. You will reuse your factory hammer and trigger pins as well, so no extra parts are needed to get it installed.
Pistol-caliber carbines run blowback actions with heavier, faster hammer strikes than a standard AR-15, which can cause reset failures with a regular rifle trigger. The 681-ST is built specifically for that job with a hardened steel bridge that protects the components. That means reliable ignition and a positive reset for quick, consistent follow-up shots.
No, this model ships factory-tuned to a 2.5 to 3 pound pull and is not adjustable. That is by design, since a fixed setting keeps every press feeling identical from the first shot to the last. If you want a lighter, crisp break without tinkering, this trigger is ready to run right out of the box.
| UPC | 081950681174 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 681ST |
| Color | Black |
| Length | 7.1500 |
| Model | |
| Product Type | Drop-In Trigger |
| Style | Single-Stage |
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