Take your PKM or M60 to the next level with the Bull Craft Hop Up Unit 2.0! Designed to outlast and outperform, this upgrade brings precision tuning with a grippy adjustment wheel inspired by Bull Craft's legendary Stoner 63. No more flimsy parts or annoying wobble—our C-Clip lock keeps everything rock-solid, even during the roughest action. Field-tested and battle-ready, this hop-up won’t quit before you do. Time to dial in your BBs with confidence and a smile!