GC_UPC Geissele Super Duty MOD1 5.56 NATO 16" 1:7" CHF Chrome Lined Bbl Black Complete Upper Receiver Group 08-548B MAP 08-548B show more like this Layaway Available + Free Shipping Scopelist GC_UPC Geissele Super Duty MOD1 5.56 NATO 16" 1:7" CHF Chrome Lined Bbl Black Complete Upper Receiver Group 08-548B MAP 08-548B show more like this Free Shipping over $250 Eurooptic