The .300 Blackout is based off of a shortened 5.56x45mm case that is necked to .30 caliber. For AR-15 platform rifles and pistols it only requires changing the barrel to go from 5.56 to .300 Blackout. The Blackout
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Starline 300 AAC Blackout Brass Bag of 50
Hornady 30733 Match 308 Cal .308 208 GR Boat-Tail Hollow Point
Starline Brass 5.56x45mm NATO Bag of 100 (Bulk Packaged)
Starline 300 Blackout Brass - Arm or Ally
Starline Brass Rifle, Handgun, and Pistol Brass
300 Blackout Brass - Small Rifle - Brass Cases
Reload with 300 Blackout Rifle Brass: Hornady, Top Brass & More
New River Sports
Patriot Pawn-N-Shop Sierra 2155 MatchKing 30 155 gr 100 Per Box
300 AAC Blackout New unprimed Brass
Starline Brass STAR300BLKEU 300 Blackout Rifle Brass 100 Per Bag
Starline Brass Idaho Guns & Outdoors
Starline .300 Blackout Brass Cases