Guns Modify EVO Full Steel Drop-In Lower Parts Set w/ GEI Style Trigger for Tokyo Marui & Guns Modify M4 MWS, Black

The EVO Drop In Lower Parts Set replaces the entire trigger group in Tokyo Marui and Guns Modify M4 MWS gas blowback rifles. If your stock trigger feels mushy or inconsistent, this is the upgrade that swaps it for a GEI-style trigger with a cleaner break and shorter reset. You get the full lower parts kit in one package—trigger, hammer, sears, pins, and springs—so there's no hunting for individual components.

What the GEI trigger does. The GEI-style trigger gives you a crisper pull and more predictable reset compared to the factory unit. That translates to tighter shot placement on semi-auto and better control during rapid follow-up shots. It's the kind of upgrade you notice immediately, especially if you've been shooting with a worn or cheap stock trigger.

Drop-in installation. The set is designed to install without gunsmithing. You remove the existing lower parts and drop in the new ones. If you're comfortable field-stripping your rifle and following a parts diagram, you can handle this at home. A few minutes with the right tools, and you're done.

Construction and fit. The parts are machined from steel and zinc alloy, finished in matte black. Steel components handle repeated hammer strikes better than polymer, and the machining tolerances are tight enough to fit TM and GM M4 MWS platforms without modification. This is a direct replacement for the Zinc Box V2 trigger group found in those rifles.

Before you buy. This is a lower receiver parts set only—it does not include the receiver itself, upper receiver, barrel, or any externals. It's compatible specifically with Tokyo Marui and Guns Modify M4 MWS gas blowback rifles. If you're running a different platform, this won't fit. Also, if your rifle is still under warranty, opening it up to install this may void that coverage.

Installation requires basic airsoft gun tools and a clean workspace. Take photos during disassembly so you can reference the parts layout when reassembling.