This video showcases the conversion of a standard AR-15 lower receiver into a 5.7x28 rifle using an AR 57 upper. The key feature highlighted is its compatibility with P90 magazines, offering a unique ammunition and magazine system for the AR-15 platform.
This video from NRA Gun of the Week features an in-depth look at the Kel-Tec P50, a semi-automatic pistol chambered in the FN 5.7x28mm cartridge. The review highlights the P50's radical design, which utilizes a P90-style magazine feeding upward into the action. Key features discussed include its blowback operation, aluminum receiver, glass-filled nylon frame, extended Picatinny rail, accessory rail, threaded barrel, integrated iron sights, and sling-mounting points. The testers found the P50 to be enjoyable to shoot, particularly with its 50-round magazine, noting that the bolt does not lock open on an empty magazine. The video emphasizes the P50's innovative nature and its suitability for the fast, flat-shooting 5.7 cartridge.
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