Mount a complete upper "Bushmaster of a higher caliber" on your existing Lower! The .270 cal. 6.8mm SPC (Special Purpose Cartridge) was developed for the military, but is now available commercially. Velocity averages a bit over 2600 FPS (with Hornady 115 Gr. V-Max), and the heavier bullet weights deliver a terminal energy capable of bringing down larger game.
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Gauge/Caliber : 6.8mm Remington
Length : 16"
Model : AR-15
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