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A*B Arms Pro 5.56 Bolt Carrier Group - Complete Nickel Boron Assembly

Part Number: BCG-556-59298
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On sale $179.99 $124.99
Retail Price:$179.99
Your Savings:$55.00(31%)
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Availability: In Stock
A*B Arms 5.56 NATO, .223 Rem, .300 BLK, .350 Legend Bolt Carrier Group

An AR-15 bolt carrier group is a piece of a firearm that houses many key parts such as the firing pin, gas key, cam pin, extractor, and bolt. With all these pieces working together the BCG can grab and feed another round out of the detachable magazine chamber. During the extraction of a cartridge, the BCG works to absorb the force of the explosion by expanding gas in the carrier. Throughout this process, gas is tapped off from the barrel and sent into the cup inside of the gas key which creates an inertial force that sends the Bolt Carrier Group back into the buffer tube. This entire process helps to reduce recoil.

About this BCG: A*B Arms is built stronger because sometimes, lives are on the line. Their products stand up to the rigors of combat, police and private security operations, where failure is not an option. The A*B Pro 5.56/.223/.300/.350 Bolt Carrier Group is a MIL-SPEC drop-in ready component for the AR-15/M4 platform. The nickel boron finish offers dry lubrication for treated parts. The carrier, bolt, and cam pin require virtually no lube during use. The phosphate coated extractor has a surface finish providing superior extraction during firing. Crafted using high-end Swiss machinery for tight tolerances and finish.

Caliber Compatibility: .223 Rem, 5.56 NATO, .300 BLK, .350 Legend - This BCG is standard for the .223 Rem, 5.56 NATO, .300 Blackout, and .350 LGND calibers, and is interchangeable between all 4 simultaneously. This includes .22 Nosler Chambered AR-15s and .223 Wylde rifles.

Finish: Nickel Boron - Nickel Boron Bolt Carrier Groups are popular for their incredible strength and reliability under minimal or zero lubrication.

Material: 158 Carpenter Steel - Bolt Head - Body - 158 Carpenter Steel is Case Hardened on the outside to prevent wear and crack formation while the inside is softer and more flexible to prevent crack propagation and absorb shock loads. 8620 Alloy Steel - Body - 8620 Steel is a carburized alloy steel meaning carbon was added to increase the hardness of the steel. 8620 is known for its high case toughness and high core toughness. Made mostly of nickel concentrate, this steel can easily withstand the firing stress of the BCG under operation.

Forward Assist Notches: This BCG comes with forward assist notches that allow the forward assist on the upper to contact the BCG, pushing it forward and locking the bolt into place. These forward assist notches can also speedily help clear malfunctions when the BCG becomes jammed.

Gas System: Direct Impingement - Direct impingement is the process of directing the gas created during the operation of a firearm through the barrel, gas block, gas tube, and eventually into the BCG again to cycle the action and prepare the firearm for another round.

Brand: A*B Arms
Model: Pro 5.56 Bolt Carrier Group - Complete Nickel Boron Assembly
Caliber Compatibility: 5.56 NATO, .223 Rem, .300 BLK, .350 Legend
Platform: AR-15
Bolt Head Material: 158 Carpenter Steel
Bolt Head Finish: Nickel Boron
Body Material: 8620 Alloy Steel
Body Finish: Nickel Boron
Style: Standard
Gas System: Direct Impingement
Forward Assist Machining: Yes
Full Auto Compatible: Yes
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