The Nordic Components 22RB Dedicated .22LR upper receiver is designed to convert a standard AR-pattern lower receiver for use in recreational shooting, training and hunting. Constructed from materials commonly used in standard AR-15 rifles, the 22RB maintains the appearance and handling characteristics of a centerfire rifle. The match-grade barrel of the 22RB is engineered to be suppressor-ready, featuring barrel threads precisely cut to specifications compatible with most popular .22 Cal suppressors. Additionally, a machined mortise is positioned behind the threads to accommodate O-rings found on specific suppressor models. Barrel with a 1:16 twist rate, precision-matched for optimal performance NC thread protection device Slim diameter aluminum handguard Aluminum upper component Barrel and bolt constructed from stainless steel M-LOK compatible handguard Black Dog 10-round magazine A device designed to securely retain the bolt carrier group when the upper receiver is detached from the lower receiver Approximate weight - 3 lb, 12 oz