Nordic Components' 22RB dedicated 22 upper receiver converts your standard AR-pattern lower to a dedicated .22LR for recreational shooting, training, and hunting. The 22RB is manufactured using the same materials as most standard AR15 rifles, ensuring that it is a dedicated .22 upper that looks and feels like a centerfire rifle. The 22RB's match-grade barrel also comes prepared to accept a suppressor - the barrel threads are cut to the proper spec for most popular .22 suppressors, and a mortise to accommodate the O-rings found on certain suppressor models is machined behind the threads. FeaturesAluminum slim diameter hand guardStainless steel bolt10 round Black Dog magazineBlack Dog Machine Bolt Saver for retaining bolt carrier group when upper is separate from lower