Prometheus Straight Trigger Sigma for M4 Series Next Generation, Silver

Upgrading a trigger isn't about adding features—it's about changing how the gun feels in your hand. The Prometheus Sigma is a straight-trIGGER design that replaces the factory curved trigger on Marui M4 Next Generation platforms, giving you a flatter face and a more consistent pull point, especially when wearing gloves or running a tighter grip.

What the straight design changes. A curved trigger contacts your finger at different points as you pull, which can shift your aim slightly with each shot. The Sigma's straight profile presents a consistent contact point, and the aluminum construction keeps weight down while adding rigidity compared to polymer factory triggers. It's a subtle change, but one that shows up most in semi-auto precision work where trigger control matters more than raw rate of fire.

Fit and compatibility. This trigger is machined specifically for the Marui M4 Next Generation platform. It does not fit standard V2 gearbox M4s, older Marui models, or clones unless they've been built to Next Gen dimensions. If you're unsure which platform your gearbox is, check your current trigger housing before ordering.

Installation note. The package includes only the trigger itself. You'll need basic gunsmithing tools and familiarity with M4 gearbox disassembly to install it. If you're not comfortable splitting a gearbox and setting trigger engagement, budget for a tech visit or practice on a spare receiver first.

Includes the trigger only—no installation hardware or tools.