KELTEC R50 5.7X28 BLACK 10 ROUND CA COMPLIANT The Kel-Tec R50 platform is designed around the FN P90/PS90 50-round magazine and is fed horizontally along the grip frame. The 5.7 cartridge is offered in several variants and is an ideal personal defense applications. Features include a 16" threaded barrel, QD sling cup, 7" of picatinny top rail space and 2" of bottom rail. This California Compliant Model features a fixed, non-folding stock and 10-round magazine.