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AO Precision 158 HPT/MPI Mil-Spec Phosphate Bolt Carrier Group AO Precision Premium Phosphate Bolt Carrier Group - 158 HPT/MPI
MSRP $149.99
DEAL OF THE DAY: $79.95
IN STOCK
(14)
Toolcraft Phosphate 158 M16 Bolt Carrier Group Toolcraft Phosphate 158 Bolt Carrier Group - MPI Bolt
MSRP $139.95
DEAL OF THE DAY: $79.95
IN STOCK
(11)
Enhanced One-Piece Helical Gas ring Enhanced One-Piece Helical Gas ring
MSRP $5.95
SALE PRICE: $2.95
IN STOCK
(3)
Toolcraft Nickel Boron M16 Bolt Carrier Group Toolcraft Nickel Boron Bolt Carrier Group - MPI Bolt
MSRP $149.95
DEAL OF THE DAY: $94.95
IN STOCK
Toolcraft Nickel Boron 158 M16 Bolt Carrier Group Toolcraft Nickel Boron 158 Bolt Carrier Group - MPI Bolt
MSRP $149.95
DEAL OF THE DAY: $92.00
IN STOCK
(9)
Toolcraft Black Nitride M16 Bolt Carrier Group Toolcraft Black Nitride Bolt Carrier Group - MPI Bolt
MSRP $139.95
DEAL OF THE DAY: $79.95
IN STOCK
(16)
AR-15 Nickel Boron Bolt - EXO Coated AR-15 Nickel Boron Bolt Assembly - MPI
MSRP $69.95
SALE PRICE: $49.95
IN STOCK
Phosphate Bolt Carrier Group 158 - MPI Phosphate Bolt Carrier Group 158 - MPI
MSRP $139.99
SALE PRICE: $79.95
IN STOCK
(17)
Titanium AR-15 Firing Pin Titanium AR-15 Firing Pin
MSRP $27.99
SALE PRICE: $17.95
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(4)
Complete M16 Bolt Carrier Group - Black Nitride Complete M16 Bolt Carrier Group - Black Nitride
Our Price: $129.99
SALE PRICE: $74.95
IN STOCK
(36)
Spikes Tactical AR15 Complete Bolt Carrier Group - 5.56MM BCG Spikes Tactical Bolt Carrier Group HPT/MPI (5.56)
MSRP $149.95
SALE PRICE: $134.96
IN STOCK
(26)
Battle Arms M16 Bolt Carrier Group BCG Battle Arms M16 Bolt Carrier Group BCG
MSRP $145.00
SALE PRICE: $135.00
IN STOCK
Spikes tactical lightweight BCG Spike's Tactical Lightweight Nickel Boron BCG
MSRP $250.00
SALE PRICE: $209.99
(Out of Stock)
(28)
Spike's Tactical Nickel Boron Bolt Carrier Group Spikes Tactical Nickel Boron Bolt Carrier Group - HPT/MPI M16 BCG (5.56)
MSRP $225.00
SALE PRICE: $202.50
(Out of Stock)
(23)
Fail Zero M16/Full Mass EXO Bolt Carrier Group - No Hammer Fail Zero M16/Full Mass Nickel Boron EXO Bolt Carrier Group - BCG
MSRP $160.00
SALE PRICE: $119.99
(Out of Stock)
(99)
RightToBear.com Nickel Boron 158 5.56 Bolt Carrier Group RTB Nickel Boron Bolt Carrier Group - 158 - MPI - M16 BCG (5.56)
MSRP $169.99
SALE PRICE: $129.99
(Out of Stock)
(39)
M16/AR15 Bolt - 9310 MPI (5.56) - Completion Kit - *Nickel Boron* M16/AR15 Bolt - 9310 MPI (5.56) - Completion Kit - (Nickel Boron) - Blem
Our Price: $67.95
SALE PRICE: $39.99
(Out of Stock)
(28)
Nickel Boron Bolt Carrier Group - 9310 - MPI -  M16 BCG (5.56 RTB Nickel Boron Bolt Carrier Group - 9310 - MPI - M16 BCG (5.56)
MSRP $169.99
SALE PRICE: $109.99
(Out of Stock)
(24)
Mil-Spec Phosphate Carrier w/ Gas Key RTB Mil-Spec Phosphate Carrier w/ Gas Key
MSRP $59.99
SALE PRICE: $45.00
(Out of Stock)
(9)
RightToBear.com AR-15 Black Nitride Lightweight BCG RTB Complete Lightweight Bolt Carrier Group - Black Nitride
MSRP $179.99
SALE PRICE: $105.00
(Out of Stock)
(13)
RightToBear.com AR-15 Black Nitride Lightweight Carrier RTB AR15 Lightweight Carrier - Black Nitride (carrier only)
MSRP $179.99
SALE PRICE: $65.00
(Out of Stock)
(13)
RCA Adjustable Gas Key RCA Adjustable Gas Key
MSRP $49.99
SALE PRICE: $39.99
(Out of Stock)
(1)
   
 

5.56/.223 300 Blackout Bolt Carrier Group

Gas-operated firearms, including various assault rifles, require a bolt carrier group (BCG) to complete the cycle when a round is fired. A complete BCG pulls a round from the magazine and loads it into the chamber before locking back into place. A popular type is the 5.56 bolt carrier group, which also works as a 5.56 .223 bolt carrier group. However, some rifle owners do not understand that many 5.56/.223 BCGs can be used as a 300 BLK BCG.

All of the bolt carrier groups from Right to Bear Arms and Supply include special features that provide the best bang for your buck. Many of them use a Carpenter 158 bolt, but some have a 9310 bolt. Models from Spike's Tactical and others are high pressure tested – HPT – and magnetic particle inspected – MPI. In addition, the Fail Zero BCG uses a full auto carrier.