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Midwest Industries built its reputation on handguards and rail systems, so when they finally jumped into the trigger market with the MI-TRIGGER-C, it caught the attention of a lot of AR builders. This curved drop-in unit gives you a factory set 3.5 pound single-stage pull, housed in a blue anodized aluminum cassette that keeps every pin and spring exactly where it belongs before it ever touches your lower receiver.
The internals are where this trigger earns its keep. The hammer and trigger are machined from S7 tool steel, heavy-hit hardened and finished in black nitride for a combination of toughness and corrosion resistance that holds up to a lot of rounds. Midwest paired that with a lightened hammer and a drop safety feature, and the result is a release that breaks clean with very little overtravel and snaps back to reset fast. Guys who've run it side by side with GI triggers say it feels familiar in the hand but noticeably smoother off the wall.
The whole point of a cassette style trigger like this curved single stage is skipping the fitting and polishing that comes with building a trigger from individual parts. It comes with anti-walk pins sized to the mil-spec .154 diameter along with the mounting screws, so most lowers accept it without any extra shimming. One thing worth knowing before you install it: there's a center set screw that Midwest calibrates at the factory, and messing with it isn't recommended since it can throw off the pull weight and void your warranty.
This trigger is built to run in both .223/5.56 AR-15 lowers and .308 AR-10 pattern receivers, so it covers a lot of ground for anyone running multiple platforms. It weighs in around 2.4 ounces, is made in the USA, and carries Midwest Industries' limited lifetime warranty, which says a lot about how much confidence they have in the build quality.
No, it's built as a self-contained cassette that drops straight into a stripped AR-15 or AR-10 lower. It includes the anti-walk pins and mounting screws, so most builders can get it installed with basic hand tools in a matter of minutes. There's no polishing, stoning, or trial fitting required like you'd see with individual trigger components.
Yes, this trigger is designed to fit most .223 AR-15 and .308/AR-10 pattern lowers since they share the same mil-spec .154 pin diameter. It's one of the reasons this trigger group has become popular with people running more than one platform.
The internals, pull weight, and materials are identical between the two. The only real difference is the shape of the trigger bow itself, curved feels closer to a traditional GI trigger, while the flat option gives a more even pull across your fingertip. It really comes down to personal preference.
It comes factory set at 3.5 pounds and isn't meant to be user adjustable. There's a center set screw inside the housing that controls this, and Midwest specifically notes that tampering with it can affect performance and will void the warranty.
| UPC | 812102033233 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | MI-TRIGGER-C |
| Shipping Weight | 0.245 |
| Style | Single-Stage |
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