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The Midwest Industries Enhanced Drop-In Trigger Kit takes the guesswork out of upgrading an AR lower. The trigger sits in an anodized aluminum cassette housing that drops straight into a standard AR-15 receiver, so you get a smooth 3.5 lb single-stage pull without messing with individual hammer and disconnector springs. It breaks clean, resets fast, and keeps overtravel low, which is exactly what you want whether you're building a range gun, a hunting rig, or a general-purpose carbine.
The internals here are the real story. The interior parts are machined from S7 tool steel, heat-treated, and finished in black nitride for solid strength and corrosion resistance. The hammer is lightened for a quicker lock time, and the whole assembly weighs in around 2.4 ounces. It's a self-contained unit, so there's no fine-tuning required out of the box, and it includes a built-in drop safety feature. Everything is CNC machined right here in the USA and backed by Midwest Industries' limited lifetime guarantee.
What makes this a genuine kit and not just a trigger is the lower parts included. You get a 60/90-degree ambidextrous safety selector, a black Magpul MAG417 trigger guard, bolt catch hardware, magazine catch parts, buffer retainer and spring, takedown and pivot pins with detents and springs, plus anti-walk pins and screws to lock the trigger cassette in place. For a fresh build that's most of your lower assembly handled in a single purchase.
Installation is straightforward for anyone comfortable with basic AR work. Clear the weapon, drop the cassette into the trigger pocket with the hammer facing the magwell, set your anti-walk pins with the included wrench, then reinstall the safety, detent, spring, and grip. There are two small setscrews under the hammer springs you can snug to the receiver floor with a 5/64 Allen wrench, but leave the center setscrew alone since it's preset at the factory. Finish with a function check and you're ready to shoot.
It's built for standard AR-15 lowers that use small trigger pins, which covers the vast majority of mil-spec receivers. The cassette design drops into the trigger pocket and locks in with the included anti-walk pins. If you're running a polymer lower, take your time seating the safety selector so it fits snug.
For most builds, no. The kit includes the trigger plus the ambi safety, Magpul trigger guard, bolt catch, mag catch, buffer retainer, and takedown and pivot pins. You'll still need to supply your own grip, buffer, buffer spring, and stock hardware to finish the rifle.
It's a single-stage trigger with a clean, crisp break and a quick reset, which makes fast follow-up shots feel natural. The lightened hammer helps lock time, and overtravel is kept low. It's a noticeable step up from a standard mil-spec trigger without being so light that it feels twitchy.
The trigger comes preset from the factory and is designed to install with no fine-tuning. There are two small setscrews under the hammer springs you snug during install, but the center setscrew should never be touched since it serves another function and adjusting it voids the warranty. If you want changes made, see a qualified gunsmith.
| UPC | 812102033240 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | MI-TRIGGER-KIT-C |
| Shipping Weight | 0.425 |
| Style | Single-Stage |
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