Luth-AR

Luth-AR Mark 12 Complete Upper Barrel Receiver Assembly 5.56 mm 27in 18in Government Rifle 1x9 1/2x28 PicatinnyKey MOD A2 Flash Hider Anodized

Luth-AR Mark 12 Complete Upper Barrel Receiver Assembly 5.56 mm 27in 18in Government Rifle 1x9 1/2x28 PicatinnyKey MOD A2 Flash Hider Anodized - Upper Receiver for AR-15 - view 1
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Luth-AR

Overview

The Luth-AR Mark 12 Complete Upper Barrel Receiver Assembly is designed for the AR-15 platform and features a 27-inch barrel chambered in 5.56 NATO. This complete assembly simplifies the build process, allowing builders to focus on performance and accuracy, particularly with its optimized length for precision shooting. This upper is commonly found in long-range setups where enhanced stability and accuracy are essential.

Specifications

MPNBAA3M12
Barrel Length27
PlatformAR-15
Caliber5.56 NATO
Thread Pitch1/2x28
AssemblyComplete
Receiver TypeA2

Available Merchants(1)

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$432
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Build history on GunPartPicker

Builders have been adding the Luth-AR Mark 12 Complete Upper Barrel Receiver Assembly 5.56 mm 27in 18in Government Rifle 1x9 1/2x28 PicatinnyKey MOD A2 Flash Hider Anodized to their builds on GunPartPicker since June 2026. All time, it ranks #397 of the 1,708 upper receivers builders have added.

Today the one retailer we track is out of stock. Listed prices start at $432.35 at Optics Planet for when it comes back.

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Build Configuration Breakdown

Aggregated and anonymized data showing how builders use this product

Gas System

50.3%
Mid-Length50.3%
Carbine25.7%
Pistol11.4%
Rifle11%
Blowback1.3%
Other0.3%

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