Stablizing Hop Up Chamber for M4

The SHS Aluminum Self-Stabilizing One-Piece M4 Hop Up Unit features Twin Self-Stabilizing Pistons that reduce overall impact to hop-up prolonging the lifespan of the unit by absorbing repeated impact from firing. Made from CNC 7075 aluminum, this extremely durable hop up comes with all the parts and pieces you need to upgrade an old existing 1 piece m4 hop up with the unit, c-clip, brass ring, and SHS bucking