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Mean Arms
The Mean Arms Bearing Delay 9mm 16'' upper receiver brings cutting-edge delay technology to the AR platform in a ready-to-run package. If you're building or upgrading a 9mm AR and want reliability without the complexity of traditional roller delay systems, this assembled upper pairs directly with any standard AR-15 lower receiver. The 16-inch barrel is threaded 1/2-28 for your choice of muzzle device, and the included MA muzzle brake handles recoil and flash reduction right out of the box.
At the heart of this upper is Mean Arms' proprietary ball bearing bolt carrier group—a departure from yesterday's roller delay guns. Three precision ball bearings deliver 50% more contact surface area than classic MP5-style rollers, which translates to superior durability under modern ammunition pressures. The system is tunable: swap the included Lifter (two come with the upper) to adjust how the bearings engage based on your ammunition type, barrel length, or whether you're running suppressed. The unique center ejector design ensures consistent rounds leave the gun, and the firing pin passes through the ejector itself for reliable function. Standard AR-15 buffers work fine—no proprietary tuning weight needed.
The package is complete: slick-side billet aluminum upper receiver (milspec), free-float hybrid handguard with a rigid polymer body and metal insert, ambidextrous charging handle, and the MA muzzle device. The 16-inch configuration weighs 3.72 lbs total, keeping the gun handy without sacrificing sight radius or velocity. Works with both standard milspec lowers and dedicated pistol-magazine lower receivers (you'll need to remove the stationary ejector on most pistol lowers if using Endomags). Two ejectorless Endomags are included so you can run the system out of the box.
This is purpose-built for shooters who want AR ergonomics with genuinely modern delay engineering—whether you're running 9mm for cost per round, recoil management, or dedicated PCC competition. No compromise, no fiddling with buffer weights or exotic carriers required.
| Caliber | 9×19mm Parabellum |
| Barrel Length | 16 inches |
| Barrel Threading | 1/2-28 |
| Upper Receiver Type | Slick-side billet machined aluminum, milspec |
| Handguard Design | Free-float hybrid (polymer body with metal insert) |
| Handguard Internal Width | ~1.375" (flat to flat) |
| Charging Handle | Ambidextrous, steel and aluminum |
| BCG Weight | Just under 11 oz |
| Total Upper Weight | 3.72 lbs |
| Lower Receiver Compatibility | Milspec AR-15 and dedicated pistol-magazine lowers |
| Buffer Compatibility | Standard AR-15 buffers |
| Included Items | Ball bearing BCG, upper receiver, handguard, charging handle, muzzle device, 2 Lifters, 2 ejectorless Endomags |
Yes. The Bearing Delay upper works with standard milspec AR-15 lower receivers. It's also compatible with dedicated pistol-magazine lower receivers; if your pistol lower has a stationary ejector, you'll need to remove it for compatibility with the ejectorless Endomags that come with the upper.
No. The Bearing Delay system is designed to function with standard AR-15 buffers, so you don't need any proprietary or exotic tuning weights. Your existing buffer setup will work.
The upper receiver includes the ball bearing bolt carrier group, slick-side billet aluminum upper, free-float handguard, ambidextrous charging handle, and MA muzzle device. You also get two Lifters (for tuning the system) and two ejectorless Endomags to get started right away.
The Lifter controls the angle of the surfaces that engage the ball bearings, which affects the delay timing and feel of the gun. By swapping Lifters, you can tune the system for different ammunition types, barrel lengths, or whether you're running with a suppressor. Two are included so you can experiment with different configurations.
Mean Arms
The Mean Arms Bearing Delay 9mm 16'' upper receiver brings cutting-edge delay technology to the AR platform in a ready-to-run package. If you're building or upgrading a 9mm AR and want reliability without the complexity of traditional roller delay systems, this assembled upper pairs directly with any standard AR-15 lower receiver. The 16-inch barrel is threaded 1/2-28 for your choice of muzzle device, and the included MA muzzle brake handles recoil and flash reduction right out of the box.
At the heart of this upper is Mean Arms' proprietary ball bearing bolt carrier group—a departure from yesterday's roller delay guns. Three precision ball bearings deliver 50% more contact surface area than classic MP5-style rollers, which translates to superior durability under modern ammunition pressures. The system is tunable: swap the included Lifter (two come with the upper) to adjust how the bearings engage based on your ammunition type, barrel length, or whether you're running suppressed. The unique center ejector design ensures consistent rounds leave the gun, and the firing pin passes through the ejector itself for reliable function. Standard AR-15 buffers work fine—no proprietary tuning weight needed.
The package is complete: slick-side billet aluminum upper receiver (milspec), free-float hybrid handguard with a rigid polymer body and metal insert, ambidextrous charging handle, and the MA muzzle device. The 16-inch configuration weighs 3.72 lbs total, keeping the gun handy without sacrificing sight radius or velocity. Works with both standard milspec lowers and dedicated pistol-magazine lower receivers (you'll need to remove the stationary ejector on most pistol lowers if using Endomags). Two ejectorless Endomags are included so you can run the system out of the box.
This is purpose-built for shooters who want AR ergonomics with genuinely modern delay engineering—whether you're running 9mm for cost per round, recoil management, or dedicated PCC competition. No compromise, no fiddling with buffer weights or exotic carriers required.
| Caliber | 9×19mm Parabellum |
| Barrel Length | 16 inches |
| Barrel Threading | 1/2-28 |
| Upper Receiver Type | Slick-side billet machined aluminum, milspec |
| Handguard Design | Free-float hybrid (polymer body with metal insert) |
| Handguard Internal Width | ~1.375" (flat to flat) |
| Charging Handle | Ambidextrous, steel and aluminum |
| BCG Weight | Just under 11 oz |
| Total Upper Weight | 3.72 lbs |
| Lower Receiver Compatibility | Milspec AR-15 and dedicated pistol-magazine lowers |
| Buffer Compatibility | Standard AR-15 buffers |
| Included Items | Ball bearing BCG, upper receiver, handguard, charging handle, muzzle device, 2 Lifters, 2 ejectorless Endomags |
Yes. The Bearing Delay upper works with standard milspec AR-15 lower receivers. It's also compatible with dedicated pistol-magazine lower receivers; if your pistol lower has a stationary ejector, you'll need to remove it for compatibility with the ejectorless Endomags that come with the upper.
No. The Bearing Delay system is designed to function with standard AR-15 buffers, so you don't need any proprietary or exotic tuning weights. Your existing buffer setup will work.
The upper receiver includes the ball bearing bolt carrier group, slick-side billet aluminum upper, free-float handguard, ambidextrous charging handle, and MA muzzle device. You also get two Lifters (for tuning the system) and two ejectorless Endomags to get started right away.
The Lifter controls the angle of the surfaces that engage the ball bearings, which affects the delay timing and feel of the gun. By swapping Lifters, you can tune the system for different ammunition types, barrel lengths, or whether you're running with a suppressor. Two are included so you can experiment with different configurations.
