AT3 10.5 Inch .300 Blackout JNL Ready Build Kit – 12 Inch SPEAR Pistol Upper
Uppers Built to Order – Ships Within 3 Business Days
Features
- Just Needs Lower kit includes an assembled .300 Blackout pistol upper plus the parts needed to complete a stripped AR-15 lower receiver
- 10.5 inch Ballistic Advantage .300 Blackout barrel uses a pistol-length gas system and 1:7 twist rate
- 12 inch AT3 SPEAR handguard and KAK slimline flash can create a tucked muzzle-device layout
- Assembled upper includes nickel boron BCG and standard mil-spec charging handle
- Lower build components include mil-spec controls, fire control springs and pins, A2 grip, Magpul BSL brace, trigger guard, and carbine buffer assembly
The AT3 10.5 inch .300 Blackout JNL Ready Build Kit is built for customers who want the pistol upper already assembled and only need to supply a stripped AR-15 lower receiver. The kit combines a 10.5 inch .300 Blackout assembled upper with a 12 inch SPEAR handguard, KAK slimline flash can, nickel boron BCG, and charging handle, plus the lower components needed for a brace-equipped AR pistol lower.
Note: This kit includes an assembled pistol upper receiver and lower build components. Stripped lower receiver is not included, and lower parts are not assembled. This kit includes a pistol brace, not a rifle stock.
Specifications
- Brand: AT3 Tactical
- Model: 10.5 inch .300 Blackout JNL Ready Build Kit with 12 inch SPEAR Handguard
- MPN: AT3-JNL-RBK-105-300BLK-12SPEAR
- Platform: AR-15
- Build Type: Just Needs Lower / assembled pistol upper with lower build components
- Upper Receiver: AT3 10.5 inch .300 Blackout Complete Assembled Pistol Upper with Nickel Boron BCG and Mil-Spec Charging Handle
- Caliber: .300 Blackout
- Barrel Length: 10.5 inches
- Barrel: Ballistic Advantage Modern Series 4150 CMV nitride barrel
- Twist Rate: 1:7
- Gas System: Pistol-length
- Muzzle Thread: 5/8×24
- Muzzle Device: KAK Slimline Flash Can
- Handguard: 12 inch AT3 SPEAR M-LOK handguard
- Bolt Carrier Group: AT3 5.56 NATO/.300 Blackout Nickel Boron M16 BCG
- Charging Handle: AT3 Standard GI Charging Handle
- Brace: Magpul BSL AR-15 Pistol Arm Brace
- Grip: AT3 AR-15 A2 Mil-Spec Pistol Grip
- Trigger Guard: STNGR Mil-Spec 7075 Trigger Guard Assembly
- Buffer System: Carbine buffer assembly
- Buffer Weight: 3.0 oz
- Color: Black
What’s Included
- 1x AT3 10.5 inch .300 Blackout Complete Assembled Pistol Upper with 12 inch SPEAR Handguard, Nickel Boron BCG, and Mil-Spec Charging Handle
- 1x AT3 AR-15 Mil-Spec Bolt Catch – Black
- 1x AT3 Mil-Spec AR-15 Bolt Catch Plunger
- 1x AT3 Mil-Spec AR-15 Bolt Catch Pin
- 1x AT3 Mil-Spec AR-15 Bolt Catch Spring
- 1x AT3 Mil-Spec AR-15 Buffer Retainer
- 1x AT3 Mil-Spec AR-15 Buffer Retainer Spring
- 1x AT3 Mil-Spec AR-15 Magazine Catch – Black
- 1x AT3 Mil-Spec AR-15 Magazine Catch Button – Black
- 1x AT3 Mil-Spec AR-15 Magazine Catch Spring
- 1x AT3 Mil-Spec AR-15 Pivot Pin – Black
- 2x AT3 Mil-Spec AR-15 Pivot Pin/Takedown Pin Detent
- 2x AT3 Mil-Spec AR-15 Pivot Pin/Takedown Pin Detent Spring
- 1x AT3 Mil-Spec AR-15 Safety Selector – Black
- 1x AT3 Mil-Spec AR-15 Selector Detent
- 1x AT3 Mil-Spec AR-15 Selector Detent Spring
- 1x AT3 Mil-Spec AR-15 Takedown Pin – Black
- 1x AT3 Mil-Spec AR-15 Pistol Grip Screw
- 1x AT3 Carbine Buffer – 3.0 oz
- 1x AT3 Carbine Buffer Spring for AR-15
- 1x AT3 Castle Nut for AR-15 Buffer Tubes – Black
- 1x AT3 Mil-Spec Buffer Tube – AR-15 – Black
- 1x AT3 Mil-Spec End Plate for AR-15 – Black
- 1x AT3 Mil-Spec AR-15 Disconnector Spring
- 1x AT3 Mil-Spec AR-15 Hammer Spring
- 2x AT3 Mil-Spec AR-15 Hammer/Trigger Pin
- 1x AT3 Mil-Spec AR-15 Trigger Spring
- 1x AT3™ GI Mil-Spec AR-15 Trigger – Curved
- 1x STNGR Mil-Spec 7075 Trigger Guard Assembly
- 1x AT3 AR-15 A2 Mil-Spec Pistol Grip
- 1x Magpul BSL AR-15 Pistol Arm Brace – Black
