Gas Blocks

SI Defense quad rail adjustable aluminum gas block

Time to upgrade your gas block and tune your rifle. Replaces the factory front sight/gas block and allows you to tune the gas system for smoother cycling and operation. Especially critical on match and varmint rifles when shooting both factory and custom-loaded ammunition, suppressed rifles or with rifles with oversized gas port holes.A simple set screw lets you control the gas flow, so you can customize the setting for each load or fix an unreliable rifle with feed and timing issues. An additional 6-32 set screw can permanently set your gas adjustment screw to keep it from creeping out over time. Three hex head 8-32 set screws clamp the block securely to the barrel. Installation instructions included.

Features a picatinny rail on each side for mounting flip-up front sights and other accessories. CNC machined from billet 7075 aluminum and hard anodized. Fits barrels with .750" O.D. at gas block. Includes all set screws. SPECS: 7075 aluminum, hard anodized, matte black, quad picatinny rail.

SI Defense quad rail adjustable aluminum gas block

SI Defense quad rail adjustable aluminum gas block