Krytac Mk1 CRB/Spare Upper With Barrel Hopup (no rail) is backordered and will ship as soon as it is back in stock.
Surplus Krytac MK1 CRB Length Upper Receiver with Hopup and inner barrel assembly.Comes with fake gas tube, and assembled barrel nut for Krytac Rails.You can remove it to install whatever rail you'd want.Features: