Action Enhancement Trigger Kit for M&P

This Action Enhancement Trigger Kit is a direct drop-in upgrade for your Smith & Wesson M&P pistol in 9mm or .40 S&W. It’s built for shooters who want a cleaner, more predictable trigger pull without sending the gun to a smith or spending half a day filing parts. The kit delivers a pull weight between 5.0 and 5.5 pounds—right in the sweet spot for a service-grade pistol that you actually trust to hit what you aim at.

You get a trigger that breaks crisply, with less creep and a shorter reset. That means faster follow-up shots and less wasted motion. The kit reduces pre-travel and over-travel by roughly 20%, so the trigger doesn’t keep moving after the shot breaks. It also cuts pull weight by about a pound compared to stock. The uptake stays smooth, and the reset is short and distinct—you’ll feel it click back into place without guessing.

Key specs and benefits:

• Pull weight: 5.0 – 5.5 lbs. (reduced ~1 lb. from stock)
• Pre-travel and over-travel reduction: Approximately 20%
• Trigger break: Crisp, with smooth uptake and positive reset
• Safety: Uses a center-mounted pivoting safety—factory safety values are maintained
• Installation: Drop-in replacement parts, no fitting required

This kit is a direct swap. Remove the factory parts, install the new ones, and you’re done. No filing, no polishing, no guesswork. It’s designed for the shooter who wants a better trigger without the hassle of gunsmithing or the cost of a full custom job.

Important fitment note: This kit requires the larger 1/8-inch sear spring and plunger setup. If your M&P still has the older 1/16-inch diameter sear plunger and spring, you need to upgrade to a current-style sear housing block before installing this kit. All function and reliability testing was done with the 1/8-inch plunger and spring. We cannot guarantee proper function without the correct size parts. Modern sear housing blocks are available at Brownells and other online firearms parts retailers.

This trigger kit is a practical upgrade for anyone running an M&P for range use, competition, or duty. You get a noticeable improvement in trigger feel and control without compromising safety or reliability. At $110, it’s a smart buy for a drop-in part that does exactly what it says.