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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 Price: $69.95
IN STOCK
(7)
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
Deal of the Day Price: $39.99
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(24)
Enhanced One-Piece Helical Gas ring Enhanced One-Piece Helical Gas ring
MSRP $5.95
Deal of the Day Price: $2.95
IN STOCK
(1)
M16/AR15 Bolt - 9310 MPI (5.56) - Completion Kit - *Black Nitride* M16/AR15 Bolt - 9310 MPI (5.56) - Completion Kit - *Black Nitride*
MSRP $67.95
Deal of the Day Price: $39.99
IN STOCK
(5)
Toolcraft Nickel Boron 158 M16 Bolt Carrier Group Toolcraft Nickel Boron 158 Bolt Carrier Group - MPI Bolt
MSRP $149.95
Deal of the Day Price: $94.95
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(8)
Toolcraft TiN Titanium Nitride Bolt Carrier Group Toolcraft TiN Titanium Nitride Bolt Carrier Group - MPI Bolt
MSRP $149.95
Deal of the Day Price: $109.99
IN STOCK
(1)
Titanium AR-15 Firing Pin Titanium AR-15 Firing Pin
MSRP $27.99
Deal of the Day Price: $15.95
IN STOCK
(3)
Toolcraft Black Nitride M16 Bolt Carrier Group Toolcraft Black Nitride Bolt Carrier Group - MPI Bolt
MSRP $139.95
Deal of the Day Price: $69.99
IN STOCK
(8)
Fail Zero M16/Full Mass Nickel Boron EXO Bolt BCG - (Black) Fail Zero M16/Full Mass Nickel Boron EXO Bolt Carrier Group - (Black)
MSRP $179.99
Deal of the Day Price: $119.99
IN STOCK
(3)
Complete M16 Bolt Carrier Group - Black Nitride Complete M16 Bolt Carrier Group - Black Nitride
Our Price: $129.99
Deal of the Day Price: $69.99
IN STOCK
(36)
Mil-Spec Phosphate Carrier w/ Gas Key RTB Mil-Spec Phosphate Carrier w/ Gas Key
MSRP $59.99
SALE PRICE: $45.00
IN STOCK
(9)
RightToBear.com AR-15 Black Nitride Lightweight Carrier RTB AR15 Lightweight Carrier - Black Nitride (carrier only)
MSRP $179.99
Deal of the Day Price: $59.95
IN STOCK
(10)
RCA Adjustable Gas Key RCA Adjustable Gas Key
MSRP $49.99
SALE PRICE: $39.99
IN STOCK
(1)
Aero Upper + Toolcraft Nitride BCG Aero Upper Receiver + Toolcraft Black Nitride Bolt Carrier Group
MSRP $230.00
Deal of the Day Price: $124.95
IN STOCK
Phosphate Bolt Carrier Group 158 - MPI Phosphate Bolt Carrier Group 158 - MPI
MSRP $139.99
Deal of the Day Price: $69.99
IN STOCK
(17)
RightToBear.com AR-15 Black Nitride Lightweight BCG RTB Complete Lightweight Bolt Carrier Group - Black Nitride
MSRP $179.99
Deal of the Day Price: $99.99
IN STOCK
(9)
Battle Arms M16 Bolt Carrier Group BCG Battle Arms M16 Bolt Carrier Group BCG
MSRP $145.00
SALE PRICE: $135.00
FREE SHIPPING APPLIES TO ENTIRE CART
IN STOCK
WMD Guns Full Mass NiB-X M16 Bolt Carrier Group WMD Guns Nickel Boron NIB-X Bolt Carrier Group M16 Full Mass - Polished
MSRP $170.00
SALE PRICE: $139.95
(Out of Stock)
(37)
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
(Out of Stock)
(26)
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)
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)
Anderson Manufacturing Black Nitride M16 Bolt Carrier Group Anderson Manufacturing Complete M16 Bolt Carrier Group - Nitride
MSRP $108.00
SALE PRICE: $79.99
(Out of Stock)
(5)
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
Deal of the day $109.99
(Out of Stock)
(24)
   
 

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.