5.56mm

- Sharp edges and rough finishes eliminated. Will NOT shred fingers and operates smoothly - Hard chromed after heat treatment - The HMB Bolt by HM Defense eliminates the pass through cam pin hole...

- Sharp edges and rough finishes eliminated. Will NOT shred fingers and operates smoothly - Hard chromed after heat treatment - The HMB Bolt by HM Defense eliminates the pass through cam pin hole and replaces it with a cam pin socket and radiused cam pin design. The new patented design eliminates the natural weak point of Mil-Spec bolts by significantly increasing the amount of metal (and strength) at the cam pin location. The result- NO MORE BROKEN BOLTS! The HMB Bolt also reduces...

Semi-Auto/ Full Auto M16 Complete bolt carrier group made by Young Manufacturing Inc. using MILSPEC quality steel on our in-house CNC machines. All carriers are then heat-treated, hard-chromed and...

Semi-Auto/ Full Auto M16 Complete bolt carrier group made by Young Manufacturing Inc. using MILSPEC quality steel on our in-house CNC machines. All carriers are then heat-treated, hard-chromed and each carrier is chrome-lined in the bolt throat. - Standard MIL-SPEC carrier with additional care taken during machining process - Sharp edges and rough finishes eliminated. Will NOT shred fingers and operates smoothly - Hard chromed after heat treatment - Made of same steel and using same processes...

These BLEM units have machining marks and finish imperfections causing them to be sold at a substantial discount. They will still function without issue. Semi-Auto/ Full Auto M16 Complete bolt...

These BLEM units have machining marks and finish imperfections causing them to be sold at a substantial discount. They will still function without issue. Semi-Auto/ Full Auto M16 Complete bolt carrier group made by Young Manufacturing Inc. using MILSPEC quality steel on our in-house CNC machines. All carriers are then heat-treated, hard-chromed and each carrier is chrome-lined in the bolt throat. - Standard MIL-SPEC carrier with additional care taken during machining process - Sharp edges and...

Variable Mass Carrier includes 4 weights that can be installed at the rear of the carrier Standard M16 weight = 11.328ozVariable Mass Carrier Weight = 10.912ozWeight 1 0.722 11.552oz...

Variable Mass Carrier includes 4 weights that can be installed at the rear of the carrier Standard M16 weight = 11.328ozVariable Mass Carrier Weight = 10.912ozWeight 1 0.722 11.552oz totalWeight 2 0.738 11.808oz totalWeight 3 0.780 12.48oz totalWeight 4 0.832 13.312oz totalPerfect for tuning your system for use with suppressors and hotter or lighter loads.  Weights are retained with a roll pin in the carrier.  BCG disassembly is unaffected by the weight. Not...

Variable Mass Carrier includes 4 weights that can be installed at the rear of the carrier Standard Chrome M16 weight = 11.328ozVariable Mass Carrier Weight = 10.912ozWeight 1 0.722 11.552oz...

Variable Mass Carrier includes 4 weights that can be installed at the rear of the carrier Standard Chrome M16 weight = 11.328ozVariable Mass Carrier Weight = 10.912ozWeight 1 0.722 11.552oz totalWeight 2 0.738 11.808oz totalWeight 3 0.780 12.48oz totalWeight 4 0.832 13.312oz totalPerfect for tuning your system for use with suppressors and hotter or lighter loads.  Weights are retained with a roll pin in the carrier.  BCG disassembly is unaffected by the...

Semi-Auto/ Full Auto M16 Complete bolt carrier group made by Young Manufacturing Inc. using MILSPEC quality steel on our in-house CNC machines. All carriers are then heat-treated, hard-chromed and...

Semi-Auto/ Full Auto M16 Complete bolt carrier group made by Young Manufacturing Inc. using MILSPEC quality steel on our in-house CNC machines. All carriers are then heat-treated, hard-chromed and each carrier is chrome-lined in the bolt throat. - Standard MIL-SPEC carrier with additional care taken during machining process - Sharp edges and rough finishes eliminated. Will NOT shred fingers and operates smoothly - Hard chromed after heat treatment - Made of same steel and using same processes...

Semi-Auto/ Full Auto M16 bolt carrier group made using MILSPEC 8620 quality steel on in-house CNC machines. All carriers are then heat-treated, and Black Nitride coated - Standard MIL-SPEC carrier...

Semi-Auto/ Full Auto M16 bolt carrier group made using MILSPEC 8620 quality steel on in-house CNC machines. All carriers are then heat-treated, and Black Nitride coated - Standard MIL-SPEC carrier with additional care taken during machining process - Sharp edges and rough finishes eliminated. Will NOT shred fingers and operates smoothly - Standard Cam Pin - Standard Gas Key (torqued to spec, not staked)Young Manufacturing does not stake carrier keys, read about why here. ...

Semi-Auto/ Full Auto M16 bolt carrier group made using MILSPEC 8620 quality steel on in-house CNC machines. All carriers are then heat-treated, and Black Nitride coated - Standard MIL-SPEC carrier...

Semi-Auto/ Full Auto M16 bolt carrier group made using MILSPEC 8620 quality steel on in-house CNC machines. All carriers are then heat-treated, and Black Nitride coated - Standard MIL-SPEC carrier with additional care taken during machining process - Sharp edges and rough finishes eliminated. Will NOT shred fingers and operates smoothly - Standard Gas Key (torqued to spec, not staked) - The HMB Bolt by HM Defense eliminates the pass through cam pin hole and replaces it with a cam pin...