The Shrike 5.56, by Ares Defense Systems, is one very cool modification for any AR-15. It replaces your upper and turns your magazine-fed AR-15/M16 into a belt-fed, without any modification whatsoever to your lower receiver. Thus, the Shrike 5.56 upper allows the weapon to fire with either linked-ammunition OR magazines, and it is designed to fit ALL AR-15 and M-16 …
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