Davidson Defense Shortshot 4.5" 300 BLK AR-15 M-LOK Upper Build with Dirty .30 Suppressor

Shortshot 4.5-inch 1:7 300 BLK AR-15 M-Lok Pistol Complete Upper Build with Witt Machine Suppressor

This complete upper build delivers a compact, suppressor-ready .300 Blackout platform with everything needed except the lower receiver and bolt carrier group. The 4.5-inch Bear Creek Arsenal barrel pairs with a freefloat M-LOK handguard and includes a Witt Machine The Dirty .30 suppressor for quiet, effective short-range performance. The adjustable gas block lets you tune cycling for subsonic or supersonic ammunition.

Key Features

• 4.5-inch Bear Creek Arsenal barrel, 1:7 twist, .300 Blackout caliber
• Freefloat M-LOK handguard with suppressor-ready design
• Adjustable skeletonized gas block for tuned performance
• Micro-length gas system optimized for short barrels
• Witt Machine The Dirty .30 suppressor included, direct-thread 5/8x24
• AR-15 upper receiver, 7075-T6 aluminum with anodized finish
• Complete AR-15 bolt carrier group and M4 charging handle included
• Made in the USA components

Perfect For

• Shooters building compact .300 Blackout pistol platforms
• Subsonic ammunition testing and suppressed shooting
• Short-range defensive or hunting applications
• Builders who want a complete upper with integrated suppressor

Suppressor-Ready Design

This upper ships with the Witt Machine The Dirty .30 suppressor already attached, giving you a fully functional, quiet shooting platform right out of the box. The direct-thread design at 5/8x24 ensures a secure, repeatable connection. The 4-inch suppressor length complements the short barrel for a balanced, maneuverable package. You can remove and reattach the suppressor as needed for your shooting environment.

Tunable Gas System Performance

The adjustable skeletonized gas block lets you dial in the gas port to match your ammunition choice. Running subsonic loads requires less gas, while supersonic rounds may need full adjustment. The micro-length gas tube paired with the short barrel creates a naturally compact system. This tuning capability keeps reliability consistent across different ammunition types without requiring upper swaps.

M-LOK Mounting Ecosystem

The 7-inch freefloat handguard uses M-LOK mounting, giving you flexibility to add optics, lights, vertical grips, or other accessories. The freefloat design isolates the barrel from handguard pressure, maintaining accuracy potential. The 1.77-inch internal diameter provides ample rail real estate for your preferred configuration. The suppressor-ready profile keeps the handguard clear of the suppressor body.

Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws. Verify suppressor compatibility before use. Ensure secure mounting before operation. Use only in accordance with applicable laws. BCG and charging handle are not included. May Dropship from Davidson Defense.