Ultradyne Quantum Gas Block Adjustable .936in UD12004. Having a gas block adjusted precisely allows the bolt carrier group to cycle only hard enough to extract and feed the new round into the chamber without hammering hard against the receiver...
Ultradyne Quantum Gas Block Adjustable .936in UD12004. Having a gas block adjusted precisely allows the bolt carrier group to cycle only hard enough to extract and feed the new round into the chamber without hammering hard against the receiver...