Unknown Bolt Carrier Groups
We track 66 Unknown bolt carrier groups across 30+ retailers, starting at $3 — 4 of the 24 shown are in stock right now. Prices update automatically, so what you see is today’s price rather than a figure someone typed into an article months ago.
Prices checked · refreshed daily
STNGR 5.56/.300 BLK Full Chrome M16 Bolt Carrier Group – C158 Bolt$179.99
STNGR 5.56/.300 BLK Phosphate – Chrome Lined M16 Bolt Carrier Group – C158 Bolt$149.99
NBS .223/5.56/300BLK M16 Profile Left-Handed Bolt Carrier Group Black Nitride$129.95
AR-15/M16 Ejector - Nitride$3.95
MSR Bolt carrier assembly with gas piston narrow stem hole 7.62x39 for standard system semiauto$199.99
Evolve Weapons Systems Bolt Carrier Group - Phosphate$184.99
NBS AR-10 Left-Handed Bolt Carrier Group Black Nitride$169.95
Modern Armory .223/5.56 9310 Bolt Carrier Group Black Nitride$159.95
Dirty Bird Dedicated 22 LR Stainless Steel Bolt Carrier Group-Blem$152.95
New Frontier Armory AR-40/10 Standard .40 S&W / 10mm BCG (Glock Compatible)$149.99
Kaw Valley Precision .45 ACP Bolt Carrier Group - Black Nitride$144.95
NBS Lightweight .223/5.56 Bolt Carrier Group - Nickel Boron$139.95
NBS .223/5.56 C158 Bolt Carrier Group Black Nitride$129.95
NBS AR-10 / 308 / 6.5 Creedmoor Bolt Carrier Group – Black Nitride$119.95
NBS 7.62x39 M16 Profile Bolt Carrier Group$109.95
NBS Lightweight .223/5.56 Bolt Carrier Group - Black Nitride$109.95
A*B Arms Pro 5.56 Bolt Assembly - Nickel Boron$99.99
NBS AR-15/M16 Gas Key - Nickel Boron$14.99
NBS AR-15/M16 Gas Key - Black Nitride$11.99
NBS AR-15/M16 Gas Key - Phosphate/Chrome-Lined$10.99
A*B Arms AR-15/M16 Firing Pin - Chrome$10.99
NBS AR-15/M16 Cam Pin - Nickel Boron$9.99
MSR Spring for 5.56x45 firing pin for spring loaded bolt head$9.99
NBS AR-15/M16 Helical Gas Ring$2.95
See all 66 Unknown bolt carrier groups →