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300 blackout subsonic ballistics12/9/2023 ![]() It's earned favor as "the world's most popular and widely used military handgun and submachine cartridge," per the 2014 edition of Cartridges of The World. It was produced in 1902 in Germany for the Luger pistol, and today it remains one of the most popular sidearm cartridges for NATO and non-NATO forces. ![]() ![]() The 9mm Parabellum, 9mm Luger, or 9x19mm (7.65x21mm) cartridge is one of the oldest handgun loads still in service. Read our 300 Blackout AR Build Guide here. 300 BLK include swapping the barrel, barrel extension, and gas system. 223-diameter casing, the AR's original bolt and carrier can be used, as well as 5.56/.223 magazines, upper and lower receivers, and parts kits. Importantly, spec-ops wanted a round that could fit in the existing M4 platform with minimal modification. (AAC) for special operations, at a time when SOF units wanted a cartridge capable of providing suppressed and un-suppressed fire with performance similar to the Russian 7.62x39mm found in the AK platform. It was developed by Advanced Armament Corps. ![]() 300 AAC Blackout (or simply 300 BLK) cartridge is a necked down 5.56 shell casing topped with a. 9mm Parabellum today, especially as both cartridges relate to the AR platform. Which one should you go with? We're comparing 300 Blackout vs. So, 300 BLK is a pretty direct competitor to 9mm when it comes to building a subsonic, compact AR that can still fire supersonic rounds. Both provide similar AR configurations to accomplish this. Both can be effectively suppressed when loaded as subs. Both cartridges can function as supersonic and subsonic loads with short barrels. We test extensively to insure our round works flawlessly during full and semi-auto fire from carbines and SBRs, suppressed and unsuppressed all while continuing to be subsonic.The AR-15 is equally capable of chambering 300 Blackout and 9mm Parabellum. Leatherhead Bullets has developed this projectile specifically for 300 AAC Blackout AR applications. A fully coated bullet also reduces your exposure to lead on your hands, and in the air. There is significantly less smoke than traditional wax lubed cast bullets. The benefits of using Hi-Tek coated bullets are many. The Hi-Tek Supercoat has been in use in Australia for over 20 years with great success! This proprietary coating contains no Moly or PTFE’s. This completely encapsulates the entire projectile in a protective shell that is self-lubricating. When applied properly, the Hi-tek Supercoat molecularly bonds to the lead alloy. The Hi-Tek Supercoat is a heat set coating developed specifically for commercial bullet casters to provide reloaders with a cast bullet that performs better than traditional cast bullets. Leatherhead Bullets proudly uses Hi-Tek Supercoat products on all of our projectiles. The bullet is a lead cast, polymer coated projectile produced by Leatherhead Bullets based in Idaho. 300 AAC Blackout subsonic ammo is loaded with top quality new brass, primers and powder. We aim to produce a round that is accurate, effective, and ultimately inexpensive for our customers. Modern Arms International has designed this specific 300 AAC Blackout subsonic round with our shooter’s in mind. Modern Arms International’s 300 AAC Blackout
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