AR-15 80% 300 AAC Blackout 7.5" Pistol Build Kit

Build a premium AR-15 pistol from the ground up with the AR-15 80% 300 AAC Blackout 7.5" Pistol Build Kit, available from Tactical Machining. This complete package includes all the high-quality components you need to assemble your rifle at home, combining reliability, performance, and value into one streamlined solution.

Featuring a factory-assembled DPMS upper, Tactical Machining 7075 forged 80% lower, and mil-spec components throughout, this kit takes the guesswork out of your build and ensures every part is engineered for compatibility and long-term dependability.

Key Features

• All-in-One Build Kit: Everything you need to complete your AR-15 pistol build at home.
• Factory-Built Upper: DPMS upper with 7.5" barrel, quad rail, BCG, and charging handle included.
• 7075 Forged Lower: Tactical Machining 80% forged lower receiver for maximum strength and durability.
• Mil-Spec Performance: Premium components designed for smooth operation and long-lasting reliability.
• Customizable Platform: Compatible with standard AR-15 parts and accessories for future upgrades.

What's Included

Upper Assembly
- DPMS 7.5" 300 AAC Blackout barrel with 1:8 twist, M4 feed ramps, and phosphate finish
- Carbine-length gas system
- Low-profile gas block and A2 flash hider
- DPMS 6.5" Quad Rail Handguard
- Forged 7075-T6 aluminum A3 upper receiver
- DPMS Black Nitride 5.56 Bolt Carrier Group
- DPMS Mil-Spec Charging Handle

Lower Components
- Tactical Machining 7075 Forged AR-15 80% Lower Receiver
- SB Tactical SBA5™ Pistol Stabilizing Brace®
- Smith Defense 3oz 6-Position Carbine Buffer Tube Kit
- Smith Defense AR-15 Lower Parts Kit

Specifications

• Barrel Length: 7.5"
• Barrel Profile: Heavy
• Barrel Material: Chrome Moly Vanadium
• Finish: Phosphate
• Chrome Lined: No
• Muzzle Thread: 5/8" x 24
• Twist Rate: 1:8
• Gas System Length: Carbine
• Gas Block: Low-profile, 0.750"
• Handguard: DPMS 6.5" Quad Rail
• Receiver: Forged 7075-T6 Aluminum
• Feed Ramps: M4
• BCG Material: Carpenter 158 Steel
• BCG Profile: Full Auto

Details

The included 7.5" 300 AAC Blackout barrel offers a perfect balance of compact size and ballistic performance, while the forged 7075-T6 aluminum receiver ensures rugged durability. Each DPMS upper is assembled to order, test-fired for reliability, and shipped factory-sealed. Combined with Tactical Machining’s precision 80% lower and premium lower parts, this kit gives you everything you need for a dependable AR-15 pistol build.

For support related to the upper receiver, please contact DPMS directly.

Compliance Notice

This kit contains an 80% lower receiver and other non-serialized firearm components. Under California law, this product is or contains an unserialized “firearm precursor part” and cannot be sold into the State of California. Orders for shipment to California or residents of California cannot be accepted.

This item is also restricted from shipping to: California, Connecticut, New Jersey, New York, Washington D.C., Washington, Hawaii, Colorado, Philadelphia, York, and Reading (PA), Maryland, Massachusetts, Nevada, Illinois, Vermont, and Rhode Island. Always check and comply with all federal, state, and local laws before purchasing or assembling firearm components.