This review focuses on Ballistic Advantage's 5.45x39mm barrels for the AR-15 platform. The video explains the 5.45x39mm cartridge as the Russian equivalent of 5.56x45mm, originating from the AK-74. While historically cost-effective, ATF import restrictions have impacted surplus ammunition pricing. The review highlights the need for a specific 5.45x39mm bolt and dedicated magazines due to dimensional differences and potential corrosive primers in surplus ammo. Ballistic Advantage barrels are constructed from durable 4150 chromoly steel with M4 feed ramps featuring Fail Zero nickel boron coating for corrosion resistance. Available lengths include 10.5 and 16 inches.
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