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  3. Davidson Defense Retro MK18 MOD 0 10.5-inch Pistol-Gas 1:8 .300 BLK AR-15 FSB Carbine-Length Quad-Rail Handguard Pistol Complete Upper Build

Davidson Defense Retro MK18 MOD 0 10.5-inch Pistol-Gas 1:8 .300 BLK AR-15 FSB Carbine-Length Quad-Rail Handguard Pistol Complete Upper Build

Part Number: PI-PC-300-63918
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Davidson Defense Retro MK18 MOD 0 10.5-inch Pistol-Gas 1:8 .300 BLK AR-15 FSB Carbine-Length Quad-Rail Handguard Pistol Complete Upper Build
On sale $319.99 $244.99
Retail Price:$319.99
Your Savings:$75.00(23%)
33 left In Stock!
Availability: In Stock

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Details

The Retro MK18 MOD 0 10.5-inch pistol upper from Davidson Defense is a gas-operated assembly chambered in .300 Blackout, built for compact tactical versatility. It features a durable 4150 CrMoV government-profile barrel with a 1:8 twist rate and a nitride finish for enhanced longevity. The system runs on a pistol-length gas system for smooth, reliable operation, but wears a carbine-length quad-rail handguard to provide extended mounting real-estate and the classic MK18 silhouette — the low-profile micro gas block (0.750") is installed beneath that handguard (the A2 F-marked front sight base is not used as a gas block), and the pistol-length gas tube manages pressure accordingly.


The upper uses a 7075-T6 anodized AR-15 receiver and ships with a complete 9310 alloy steel bolt carrier group and a GI birdcage flash hider with 5/8x24 TPI threading. Crisp, compact, and purpose-built, it’s a solid choice for gunsmiths seeking a reliable, high-performance pistol upper.

Specifications

Caliber: .300 Blackout

Barrel Material: 4150 CrMoV

Barrel Length: 10.5-inch

Barrel Twist Rate: 1:8

Barrel Profile: Government

Barrel Thread Pitch: 5/8x24

Barrel Finish: Nitride

Barrel Gas System Length: Pistol Length

Upper Receiver Name: AR-15 Upper Receiver, M4 Feed ramps

Upper Receiver Material: 7075 T6 Aluminum

Upper Receiver Finish: Anodized

Gas Block Name: Micro Low-Profile Gas Block

Gas Block Size: 0.750

Charging Handle: AR-15 M4 Charging Handle Mil-Spec Quality

Bolt Carrier Name: AR-15 5.56/.223/.300/.350 Complete Bolt Carrier Group

Bolt Carrier Material: 9310 Alloy Steel

Bolt Carrier Finish: Nitride

Muzzle Device: AR-15 5/8x24 TPI GI Birdcage Flash Hider for .308 7.62x39 .300 Blackout

Handguard Style: Carbine-Length Quad-Rail Handguard

Front Sight Base: A2 F-Marked Base

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