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The factory trigger in most SIG MPX builds does the job, but it leaves a lot on the table. This Timney 683S swaps it out for a self-contained, drop-in unit that's factory tuned to a 4.5 lb single-stage pull with no creep, a clean break, and a short reset. Timney hand tests and calibrates each one on an action before it ships, so what you feel at the range is what came off the bench.
The MPX runs a pair of recoil springs that cycle fast and hit hard, and that violent blowback is rough on trigger parts. Standard AR-15 triggers weren't made for it, which is why so many people who drop one in end up with broken hammers or disconnectors. This trigger is engineered specifically for the MPX, with a hardened steel bridge that shields the internals from that abuse. It's the same platform SIG partnered with Timney on for their competition PCC guns, so it's a proven fit.
This is about as easy as trigger upgrades get. Pull your factory trigger, drop the Timney into the trigger well with the rounded edge of the bridge facing the safety, reuse your original hammer and trigger pins, and lock it down with the set screws in the housing. Those set screws keep the pins from walking out under recoil. You'll reuse your factory safety selector too, and no additional parts are needed. Most folks have it done in well under ten minutes with a punch and a hex wrench.
The curved trigger shoe gives you that familiar, natural finger placement a lot of people prefer over a flat blade. Paired with the crisp single-stage break and minimal overtravel, it makes follow-up shots and tighter groups a lot more repeatable. Whether your MPX is a range toy, a PCC competition gun, or a home defense setup, this is one of the simplest upgrades that makes a real difference in how the gun shoots. Proudly made in the USA.
Yes, this 683S is designed specifically for the SIG MPX and is compatible across the caliber options. It's a self-contained drop-in unit, so it goes into the MPX trigger well and reuses your factory hammer pins, trigger pins, and safety selector. Keep in mind it's an MPX-specific trigger and is not meant for standard AR-15 lowers.
No gunsmithing required. You'll remove the factory trigger, drop the Timney in with the rounded edge of the bridge facing the safety, reinstall your original pins, and tighten the set screws in the housing to lock everything in place. Most people knock it out in under ten minutes with a punch and a hex wrench.
The MPX's dual recoil springs cycle fast and hard, and that blowback beats up trigger components in a way standard AR triggers weren't built to handle. That abuse is what leads to broken hammers and disconnectors with non-MPX triggers. This Timney uses a hardened steel bridge to protect the internals from that punishment, which is why an MPX-specific trigger matters.
No, the 683S comes factory tuned to a fixed 4.5 lb single-stage pull with no creep and a clean break. Each unit is hand tested and calibrated before it leaves Timney, so it's ready for the range right out of the box with no tinkering needed. If you want an adjustable option, Timney makes a two-stage MPX trigger as well.
| UPC | 081950683239 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 683S |
| Color | Black |
| Length | 7.0500 |
| Model | |
| Product Type | Trigger |
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