AeroPrecision144603131
Aero Precision M4E1T Complete - Upper 10" Barrel 300Blk$590.98
Availability: In Stock
Current Stock: Out of stock
The Aero Precision M4E1T Complete Upper with 10.5" 5.56 barrel is a ready-to-assemble upper receiver built for shooters who need a compact, versatile platform without compromise. This short-barreled upper pairs Aero's proven M4E1 threaded upper receiver with a 10.5" carbine-length barrel and their new ATLAS R-ONE handguard—a lightweight, modular setup that doesn't sacrifice real estate for attachments or a solid mounting platform. If you're building an SBR, truck gun, or compact home-defense AR, this complete upper gives you a professional-grade foundation straight out of the box.
The M4E1T upper receiver features Aero's enhanced forging with a billet-look profile, M4 feedramps, and a new picatinny configuration that works seamlessly with their Enhanced Series handguards. You get port door and forward assist pre-installed, laser-engraved T-marks, and .250 takedown pin holes. The 10" ATLAS R-ONE M-LOK handguard keeps things slim and light while offering quick-disconnect sling sockets at the 3, 6, and 9 o'clock positions and a full top picatinny rail for optics, lights, or other gear. The 4150 CrMoV barrel is QPQ-finished for corrosion resistance, twist-rated 1/7 for modern ammunition, and comes with a standard A2 flash hider and low-profile gas block.
One thing to know: this upper ships assembled and ready to work with any mil-spec AR15 lower, but it does not include a bolt carrier group or charging handle—you'll source those separately. The muzzle brake is not pinned or welded; if you're building a registered SBR or plan to pin and weld for a rifle build, that's a step you'll handle with a gunsmith to meet ATF specifications.
| Caliber | 5.56 NATO |
| Barrel Length | 10.5" |
| Barrel Profile | Carbine |
| Barrel Material | 4150 CrMoV, QPQ finish |
| Twist Rate | 1/7 |
| Gas System | Carbine-length |
| Gas Port | .0785" |
| Gas Block Journal | .750" |
| Handguard | ATLAS R-ONE M-LOK, 10" |
| Handguard ID/OD | 1.3" / 1.5" |
| Receiver Finish | Anodized Black or Cerakote FDE (model dependent) |
| Takedown Pins | .250" holes |
| Feed Ramps | M4 extension |
| Assembly Status | Fully assembled |
This complete upper comes fully assembled with the upper receiver, barrel, handguard, gas block, gas tube, and flash hider. You'll need to add a bolt carrier group, charging handle, and a compatible lower receiver to complete the rifle. The flash hider is not pinned or welded—if you plan a registered SBR or want to pin and weld for a 16" rifle build, that work is handled separately by you or a gunsmith.
Yes. The M4E1T upper is compatible with any mil-spec AR15 lower receiver and uses standard .250" takedown pins.
The 10.5" carbine-length barrel uses a carbine-length gas system with a .0785" gas port and .750" gas block journal.
Yes. The ATLAS R-ONE handguard includes a full-length top picatinny rail that accommodates any standard picatinny-mounted optic or accessory. The handguard is also compatible with low-profile gas blocks and works with mil-spec AR15 uppers and barrels.
SKU: 144603067 • Width: 3.8in • Height: 4in • Depth: 23.2in • Weight: 3.25oz
Availability: In Stock
Current Stock: Out of stock
The Aero Precision M4E1T Complete Upper with 10.5" 5.56 barrel is a ready-to-assemble upper receiver built for shooters who need a compact, versatile platform without compromise. This short-barreled upper pairs Aero's proven M4E1 threaded upper receiver with a 10.5" carbine-length barrel and their new ATLAS R-ONE handguard—a lightweight, modular setup that doesn't sacrifice real estate for attachments or a solid mounting platform. If you're building an SBR, truck gun, or compact home-defense AR, this complete upper gives you a professional-grade foundation straight out of the box.
The M4E1T upper receiver features Aero's enhanced forging with a billet-look profile, M4 feedramps, and a new picatinny configuration that works seamlessly with their Enhanced Series handguards. You get port door and forward assist pre-installed, laser-engraved T-marks, and .250 takedown pin holes. The 10" ATLAS R-ONE M-LOK handguard keeps things slim and light while offering quick-disconnect sling sockets at the 3, 6, and 9 o'clock positions and a full top picatinny rail for optics, lights, or other gear. The 4150 CrMoV barrel is QPQ-finished for corrosion resistance, twist-rated 1/7 for modern ammunition, and comes with a standard A2 flash hider and low-profile gas block.
One thing to know: this upper ships assembled and ready to work with any mil-spec AR15 lower, but it does not include a bolt carrier group or charging handle—you'll source those separately. The muzzle brake is not pinned or welded; if you're building a registered SBR or plan to pin and weld for a rifle build, that's a step you'll handle with a gunsmith to meet ATF specifications.
| Caliber | 5.56 NATO |
| Barrel Length | 10.5" |
| Barrel Profile | Carbine |
| Barrel Material | 4150 CrMoV, QPQ finish |
| Twist Rate | 1/7 |
| Gas System | Carbine-length |
| Gas Port | .0785" |
| Gas Block Journal | .750" |
| Handguard | ATLAS R-ONE M-LOK, 10" |
| Handguard ID/OD | 1.3" / 1.5" |
| Receiver Finish | Anodized Black or Cerakote FDE (model dependent) |
| Takedown Pins | .250" holes |
| Feed Ramps | M4 extension |
| Assembly Status | Fully assembled |
This complete upper comes fully assembled with the upper receiver, barrel, handguard, gas block, gas tube, and flash hider. You'll need to add a bolt carrier group, charging handle, and a compatible lower receiver to complete the rifle. The flash hider is not pinned or welded—if you plan a registered SBR or want to pin and weld for a 16" rifle build, that work is handled separately by you or a gunsmith.
Yes. The M4E1T upper is compatible with any mil-spec AR15 lower receiver and uses standard .250" takedown pins.
The 10.5" carbine-length barrel uses a carbine-length gas system with a .0785" gas port and .750" gas block journal.
Yes. The ATLAS R-ONE handguard includes a full-length top picatinny rail that accommodates any standard picatinny-mounted optic or accessory. The handguard is also compatible with low-profile gas blocks and works with mil-spec AR15 uppers and barrels.
SKU: 144603067 • Width: 3.8in • Height: 4in • Depth: 23.2in • Weight: 3.25oz