![AR 300AAC Blackout 16'' Barrel 15'' Keymod Handguard | Carbine Upper Build UPK19 [ASSEMBLED]](https://outdoorsportsusa.com/image/cache/catalog/demo/UPK-19-AR300BLKC/0%2013%20UPK-19-AR300BLKC-1000x1000.jpg "AR 300AAC Blackout 16'' Barrel 15'' Keymod Handguard | Carbine Upper Build UPK19 [ASSEMBLED]")
![AR 300AAC Blackout 16'' Barrel 15'' Keymod Handguard | Carbine Upper Build UPK19 [ASSEMBLED]](https://outdoorsportsusa.com/image/cache/catalog/demo/UPK-19-AR300BLKC/2%202023-1000x1000.jpg "AR 300AAC Blackout 16'' Barrel 15'' Keymod Handguard | Carbine Upper Build UPK19 [ASSEMBLED]")
-53 %
BCA 16" 300 AAC Blackout | Parkerized |
Made in U.S.A. AR-10 / LR-308 Flash Can Muzzle Brake
Aluminum V.2AR-15 Mil-Spec Upper Receiver | Made in U.S.A.AR-15 Tactical Rifle Charging Handle AssemblyAR-15 Ejection Port Cover | Dust Cover
Assembly..
$249.99 $529.99
![AR 300 BLACKOUT 7.5'' BARREL W/ 7'' M-LOK Handguard | Pistol Upper Build UPK57 [ASSEMBLED]](https://outdoorsportsusa.com/image/cache/catalog/demo/UPK-57-AR300BLKP/0%2013%20UPK-57-AR300BLKP-1000x1000.jpg "AR 300 BLACKOUT 7.5'' BARREL W/ 7'' M-LOK Handguard | Pistol Upper Build UPK57 [ASSEMBLED]")
![AR 300 BLACKOUT 7.5'' BARREL W/ 7'' M-LOK Handguard | Pistol Upper Build UPK57 [ASSEMBLED]](https://outdoorsportsusa.com/image/cache/catalog/demo/UPK-57-AR300BLKP/1%202023-1000x1000.jpg "AR 300 BLACKOUT 7.5'' BARREL W/ 7'' M-LOK Handguard | Pistol Upper Build UPK57 [ASSEMBLED]")
-56 %
BCA 7.5" 300 AAC Blackout Pistol barrel
| Made in U.S.A. AR-10 .308 A2 Style Birdcage Muzzle Brake
W/Crush WasherAR-15 Mil-Spec Upper Receiver | Made in U.S.A.AR-15 Tactical Rifle Charging Handle AssemblyAR-15 Eject..
$219.99 $499.99
![AR 300 BLACKOUT 7'' BARREL W/ 7'' M-LOK SUPER SLIM Free Float Handguard | Pistol Upper Build UPK47 [ASSEMBLED]](https://outdoorsportsusa.com/image/cache/catalog/demo/UPK-47-AR300BLKP/0ac-1000x1000.png "AR 300 BLACKOUT 7'' BARREL W/ 7'' M-LOK SUPER SLIM Free Float Handguard | Pistol Upper Build UPK47 [ASSEMBLED]")
![AR 300 BLACKOUT 7'' BARREL W/ 7'' M-LOK SUPER SLIM Free Float Handguard | Pistol Upper Build UPK47 [ASSEMBLED]](https://outdoorsportsusa.com/image/cache/catalog/demo/UPK-47-AR300BLKP/3AB-1000x1000-1000x1000.jpg "AR 300 BLACKOUT 7'' BARREL W/ 7'' M-LOK SUPER SLIM Free Float Handguard | Pistol Upper Build UPK47 [ASSEMBLED]")
-59 %
BCA 7.5" 300 AAC Blackout Pistol barrel
| Made in U.S.A. AR-10 .308 A2 Style Birdcage Muzzle Brake
W/Crush WasherAR-15 Mil-Spec Upper Receiver | Made in U.S.A.AR-15 Tactical Rifle Charging Handle AssemblyAR-15 Eject..
$199.99 $489.99
![AR 300 Blackout 16'' Barrel W/ 10'' 12'' 15'' M-LOK Handguard Option | Carbine Upper Build UPK46 [ASSEMBLED]](https://outdoorsportsusa.com/image/cache/catalog/demo/UPK-46-AR300BLKC/1ac-1000x1000.png "AR 300 Blackout 16'' Barrel W/ 10'' 12'' 15'' M-LOK Handguard Option | Carbine Upper Build UPK46 [ASSEMBLED]")
![AR 300 Blackout 16'' Barrel W/ 10'' 12'' 15'' M-LOK Handguard Option | Carbine Upper Build UPK46 [ASSEMBLED]](https://outdoorsportsusa.com/image/cache/catalog/demo/UPK-46-AR300BLKC/2ac-1000x1000.jpg "AR 300 Blackout 16'' Barrel W/ 10'' 12'' 15'' M-LOK Handguard Option | Carbine Upper Build UPK46 [ASSEMBLED]")
-43 %
16" .300 Blackout 1:8 Twist | Pistol Gas
System| Parkerized | Made in U.S.A.AR-10 .308 A2 Style Birdcage Muzzle Brake
W/Crush WasherAR-15 Mil-Spec Upper Receiver | Made in U.S.A.AR-15 Tactical Rifle Charging Handle AssemblyAR-..
$279.99 $489.99
![AR 300 Blackout 16'' Barrel W/ 10'' 12'' 15'' Keymod Handguard option | Carbine Upper Build UPK48 [ASSEMBLED]](https://outdoorsportsusa.com/image/cache/catalog/demo/UPK-48-AR300BLKC/1ac-1000x1000.png "AR 300 Blackout 16'' Barrel W/ 10'' 12'' 15'' Keymod Handguard option | Carbine Upper Build UPK48 [ASSEMBLED]")
![AR 300 Blackout 16'' Barrel W/ 10'' 12'' 15'' Keymod Handguard option | Carbine Upper Build UPK48 [ASSEMBLED]](https://outdoorsportsusa.com/image/cache/catalog/demo/UPK-48-AR300BLKC/2ac-1000x1000.jpg "AR 300 Blackout 16'' Barrel W/ 10'' 12'' 15'' Keymod Handguard option | Carbine Upper Build UPK48 [ASSEMBLED]")
-48 %
16" .300 Blackout 1:8 Twist | Pistol Gas
System| Parkerized | Made in U.S.A.AR-10 .308 A2 Style Birdcage Muzzle Brake
W/Crush WasherAR-15 Mil-Spec Upper Receiver | Made in U.S.A.AR-15 Tactical Rifle Charging Handle AssemblyAR-..
$249.99 $479.99
![AR 300 Blackout 16'' Barrel W/ 10" 12" Free Float Handguard | Carbine Upper Build UPK49 [ASSEMBLED]](https://outdoorsportsusa.com/image/cache/catalog/demo/UPK-49-AR300BLKC/1AC-1000x1000.png "AR 300 Blackout 16'' Barrel W/ 10\" 12\" Free Float Handguard | Carbine Upper Build UPK49 [ASSEMBLED]")
![AR 300 Blackout 16'' Barrel W/ 10" 12" Free Float Handguard | Carbine Upper Build UPK49 [ASSEMBLED]](https://outdoorsportsusa.com/image/cache/catalog/demo/UPK-49-AR300BLKC/2ac-1000x1000.jpg "AR 300 Blackout 16'' Barrel W/ 10\" 12\" Free Float Handguard | Carbine Upper Build UPK49 [ASSEMBLED]")
-44 %
16" .300 Blackout 1:8 Twist | Pistol Gas
System| Parkerized | Made in U.S.A.AR-10 .308 A2 Style Birdcage Muzzle Brake
W/Crush WasherAR-15 Mil-Spec Upper Receiver | Made in U.S.A.AR-15 Tactical Rifle Charging Handle AssemblyAR-..
$269.99 $479.99
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