This is a Nordic Components Upper known as the 22RB chambered in 22 LR, model 22RB-UPPER-16-KIT.
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.
Features:
1-16 twist match barrel
NC-PCC flash suppressor
Aluminum slim diameter hand guard
Aluminum upper
