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This is 5.56 Federal Commercial Version MK318 MOD-0 62gr. Special Operations Science and Technology (SOST) Open Tip Match Ammo. This new SOST round from ATK was designed for the USMC as a supplemental round to M855 green tip with more desirable terminal characteristics, and it must be used in a 5.56 chambered weapon. Designated as MK318 MOD-0 the round was designed as a barrier defeating round with superior penetration and good ballistic stability. MK318 utilizes a 62 grain open tip boat tail match bullet with a lead core and reverse copper jacket creating the open tip. This ammo comes packed in 20rds. per box.
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