Home / AR Upper Components / FAIL ZERO M16/M4 BOLT CARRIER GROUP NICKLE BORON BCG View cart “LBE Unlimited ARBGR – Bolt Gas Rings” has been added to your cart. FAIL ZERO M16/M4 BOLT CARRIER GROUP NICKLE BORON BCG$149.99 1 in stock [] FAIL ZERO M16/M4 BOLT CARRIER GROUP NICKLE BORON BCG quantity Add to cart UPC: 881314861781 SKU: 009-FZM16/4-01-NH Category: AR Upper Components Product ID: 11706 Related products Bravo Company Manufacturing BCMGUNFIGHTER Ambidextrous Charging Handle Mod 3×3 – Large Latch $89.95 Add to cart SOLGW 5.56 BOLT CARRIER GROUP 158 CARPENTER SP/HPT/MPI $179.00 Add to cart Out of stock SIONICS Gas Tube W/Roll Pin – Melonite – Midlength $16.95 Read more SPRINCO ENHANCED CHROME MOLY EJECTOR AND SAFETY SPRING $4.39 Add to cart