AR Five Seven: 5.7x28mm AR Upper

albums-c108-01coltcolt-ar-57008-tm.jpgThis is very interesting. A one piece 5.7x28mm modular upper that attaches to a AR-15 lower receiver and uses 50 round FN P90 magazines. TrueWPN at took these photos. Click to expand. Well this thing is interesting. Its a AR-15- PS90 cross bread. The one piece modular upper snaps onto any AR-15 lower. Allowing […]

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