4.5" Micro ARP Upper Assembly – 5.56, .300 BLK, 7.62×39 & .338 ARC | Mini Can
| Brand: | Moriarti Armaments |
| Product Code: | MAR-AR15-4-CAN |
| Availability: | In Stock |
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$269.95
- $429.95
Micro ARP
4.5" Micro ARP Upper Assembly – 5.56, .300 BLK, 7.62×39 & .338 ARC | Mini Can
The Moriarti 4.5" Micro ARP Upper Assembly with Mini Can is a compact AR-15 upper configuration available in four chamberings: 5.56 NATO, .300 AAC Blackout, 7.62×39, and .338 ARC.
Each configuration features a 4.5" 4150 chrome moly vanadium (CMV) barrel with a nitride finish, a 4" free-float M-LOK handguard, and a micro-length gas system.
The assembly includes a forged 7075-T6 aluminum upper receiver and a Mini Can muzzle device. Barrel twist rates and muzzle thread specifications vary by selected caliber.
Key Features
4.5" Barrel: 4150 chrome moly vanadium steel with nitride treatment.
Four Caliber Choices: 5.56 NATO, .300 AAC Blackout, 7.62×39, and .338 ARC.
Caliber-Specific Twist Rates: 1:7, 1:8, or 1:10, depending on the selected chambering.
Micro-Length Gas System: Included across all four configurations.
4" Free-Float M-LOK Handguard: Slim-profile aluminum handguard.
Mini Can: Included muzzle device.
Forged Upper Receiver: 7075-T6 aluminum construction.
Black Finish: Upper receiver and handguard.
Assembled Upper: Supplied without a bolt carrier group or charging handle.
Specifications
| Specification | Details |
|---|---|
| Manufacturer | Moriarti Armaments |
| Series | Micro ARP |
| Platform | AR-15 |
| Product Type | Upper Assembly |
| Caliber Options | 5.56 NATO, .300 BLK, 7.62×39, .338 ARC |
| Barrel Length | 4.5" |
| Barrel Material | 4150 CMV Steel |
| Barrel Finish | Nitride |
| Gas System | Micro Length |
| Handguard | 4" Free-Float M-LOK |
| Upper Receiver | Forged 7075-T6 Aluminum |
| Muzzle Device | Mini Can |
| Bolt Carrier Group | Not Included |
| Charging Handle | Not Included |
| Lower Receiver | Not Included |
Caliber-Specific Specifications
| Chamber | Twist Rate | Muzzle Threads |
|---|---|---|
| 5.56 NATO | 1:7 | 1/2×28 |
| .300 AAC Blackout | 1:8 | 5/8×24 |
| 7.62×39 | 1:10 | 5/8×24 |
| .338 ARC | 1:8 | 5/8×24 |
Package Includes
Assembled 4.5" Micro ARP upper in the selected caliber
4150 CMV nitride barrel
4" free-float M-LOK handguard
Micro-length gas system
Mini Can muzzle device
Forged 7075-T6 aluminum upper receiver
Bolt carrier group, charging handle, and lower receiver are not included.
Frequently Asked Questions
Which calibers are available?
The Micro ARP Mini Can Upper is offered in 5.56 NATO, .300 AAC Blackout, 7.62×39, and .338 ARC.
Are the barrel twist rates identical for every caliber?
No. The twist rates are 1:7 for 5.56 NATO, 1:8 for .300 BLK, 1:10 for 7.62×39, and 1:8 for .338 ARC.
What barrel finish is used?
All four configurations feature a nitride-treated 4150 CMV barrel.
What handguard is included?
A 4" free-float M-LOK handguard.
Is the Mini Can included?
Yes. The Mini Can is part of the standard configuration.
Does the upper include a bolt carrier group and charging handle?
No. Neither component is included.
Product Image Notice
Images may not be the exact representation of the product.
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