B
blenthe08excellent
Reviewed on April 3, 2026Verified with Build
smooth cycling
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Colt 5.56 Nato M16 / Ar-15 Bolt Carrier Group
Colt
Overview
The Colt 5.56 NATO M16 / AR-15 Bolt Carrier Group is designed for reliable function in both 5.56 NATO and .300 BLK calibers, making it a versatile choice for various builds. Its phosphate finish offers corrosion resistance, while the M16-style carrier ensures smooth operation and enhanced reliability during cycling. This bolt carrier group is commonly found in pistol gas system configurations, allowing for a compact and efficient setup in your AR-15 builds.
Specifications
MPNCTSP64028
Caliber5.56 NATO / .300 BLK
FinishPhosphate
StyleM16 Bolt Carrier
Frequently Built With
Based on build data
Colt M4 Commando 5.56mm Semi-Auto Lower Receiver Assembly With "LE" Prefix
CMMG AR-15 HD Pivot and Takedown Pin Parts Kit - 55AFF3B
Bravo Company Mfg Upper Receiver Assembly w/ Laser T-Markings, Hard Coated Anodized - 4-UR-M4
Upper Receiver
Radian Forward Assist - 7075 Aluminum - Black
Magpul AFG-2 Angled Fore Grip - Black
Aero Precision Ar-15 Breach Charging Handle Ambidextrous Small Levers
Build Configuration Breakdown
Aggregated and anonymized data showing how builders use this product
PlatformBased on real build data showing which platform (AR-15, AR-10, AR-9) builders pair with this product.
90.9%
AR-1590.9%
AR-109.1%
CaliberBased on real build data showing which calibers builders choose alongside this product.
58.3%
5.56 NATO58.3%
300 Blackout41.7%
Gas SystemBased on real build data showing which gas system lengths builders use with this product.
50%
Pistol50%
Carbine30%
Mid-Length20%
| Product | Category | Times Built Together |
|---|---|---|
| Colt M4 Commando 5.56mm Semi-Auto Lower Receiver Assembly With "LE" Prefix | 5 | |
| CMMG AR-15 HD Pivot and Takedown Pin Parts Kit - 55AFF3B | 3 | |
| Bravo Company Mfg Upper Receiver Assembly w/ Laser T-Markings, Hard Coated Anodized - 4-UR-M4 | Upper Receiver | 3 |
| Radian Forward Assist - 7075 Aluminum - Black | 3 | |
| Magpul AFG-2 Angled Fore Grip - Black | 3 | |
| Aero Precision Ar-15 Breach Charging Handle Ambidextrous Small Levers | 2 |
| Platform | Percentage |
|---|---|
| AR-15 | 90.9% |
| AR-10 | 9.1% |
| Caliber | Percentage |
|---|---|
| 5.56 NATO | 58.3% |
| 300 Blackout | 41.7% |
| Gas System | Percentage |
|---|---|
| Pistol | 50% |
| Carbine | 30% |
| Mid-Length | 20% |
Builds Featuring This Part
See all 7 →Builds in the community that include the Colt 5.56 Nato M16 / Ar-15 Bolt Carrier Group
| Build | Parts | Total |
|---|---|---|
 | 11 | $1363.37 |
 | 22 | $2175.54 |
 | 19 | $2072.08 |
| 16 | $1079.77 |
 | 21 | $1888.77 |
 | 8 | $1346.87 |
 | 8 | $1544.92 |
Customer reviews
5.0out of 5
2 global ratings
Top reviews
B
bl4ck0niColt M16 BCG stays clean
Reviewed on March 16, 2026Verified with Build
Colt 5.56 M16 BCG runs cleaner than parkerized BCGs. Bolt is the standard Colt mil-spec carpenter steel. Gas key is correctly staked from the factory. Cycles 600 rounds in a class without a hiccup. Premium quality BCG from Colt.
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