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Colt
The Colt M4 LE6921EPR upper receiver group with bolt carrier group gives you a complete, ready-to-run upper assembly built on Colt's proven EPR (Enhanced Patrol Rifle) platform. This 14.5-inch configuration pairs Colt's chrome-lined, button-rifled barrel with a free-float Centurion Arms M-LOK handguard, delivering the kind of accuracy and modularity serious shooters expect from a Colt pedigree upper. Drop it on any AR-15 lower receiver to build a compact, capable rifle suitable for home defense, patrol work, or general shooting.
The barrel features a 1-7 twist rate and phosphate finish for durability in demanding conditions. You're getting the complete package here—upper receiver, barrel, handguard, bolt carrier group, and charging handle all in one. This eliminates guesswork on component compatibility and gets you shooting faster than sourcing parts individually.
Whether you're building a new AR or upgrading an existing lower, this upper group saves time and delivers the kind of fit and finish you get from a factory rifle maker. The M-LOK slots across the free-float handguard give you plenty of real estate for lights, grips, and other accessories without barrel contact interference.
| Barrel Length | 14.5 inches |
| Barrel Twist | 1-7 |
| Barrel Finish | Phosphate |
| Barrel Construction | Chrome lined, button rifled |
| Handguard | Centurion Arms free-float M-LOK |
| Includes | Bolt carrier group, charging handle |
| Compatibility | AR-15 lower receiver |
This upper receiver is compatible with any standard AR-15 lower receiver. You'll need to source a lower separately if you don't already have one.
Yes. This is the complete upper group version, which includes both the M16 bolt carrier group and charging handle. You're getting everything needed to mate to a lower and run.
Yes. The free-float Centurion Arms M-LOK handguard includes M-LOK slots throughout, giving you plenty of mounting options for lights, vertical grips, bipods, and other tactical gear without any barrel contact.
The 1-7 twist is a versatile rate that stabilizes a wide range of 5.56mm/.223 Remington ammunition, from lighter 55-grain rounds through heavier match and hunting loads.
Colt
The Colt M4 LE6921EPR upper receiver group with bolt carrier group gives you a complete, ready-to-run upper assembly built on Colt's proven EPR (Enhanced Patrol Rifle) platform. This 14.5-inch configuration pairs Colt's chrome-lined, button-rifled barrel with a free-float Centurion Arms M-LOK handguard, delivering the kind of accuracy and modularity serious shooters expect from a Colt pedigree upper. Drop it on any AR-15 lower receiver to build a compact, capable rifle suitable for home defense, patrol work, or general shooting.
The barrel features a 1-7 twist rate and phosphate finish for durability in demanding conditions. You're getting the complete package here—upper receiver, barrel, handguard, bolt carrier group, and charging handle all in one. This eliminates guesswork on component compatibility and gets you shooting faster than sourcing parts individually.
Whether you're building a new AR or upgrading an existing lower, this upper group saves time and delivers the kind of fit and finish you get from a factory rifle maker. The M-LOK slots across the free-float handguard give you plenty of real estate for lights, grips, and other accessories without barrel contact interference.
| Barrel Length | 14.5 inches |
| Barrel Twist | 1-7 |
| Barrel Finish | Phosphate |
| Barrel Construction | Chrome lined, button rifled |
| Handguard | Centurion Arms free-float M-LOK |
| Includes | Bolt carrier group, charging handle |
| Compatibility | AR-15 lower receiver |
This upper receiver is compatible with any standard AR-15 lower receiver. You'll need to source a lower separately if you don't already have one.
Yes. This is the complete upper group version, which includes both the M16 bolt carrier group and charging handle. You're getting everything needed to mate to a lower and run.
Yes. The free-float Centurion Arms M-LOK handguard includes M-LOK slots throughout, giving you plenty of mounting options for lights, vertical grips, bipods, and other tactical gear without any barrel contact.
The 1-7 twist is a versatile rate that stabilizes a wide range of 5.56mm/.223 Remington ammunition, from lighter 55-grain rounds through heavier match and hunting loads.
