Kel-Tec R50BLK R50 5.7x28mm 50+1 16.10" Threaded Barrel, Black Receiver & Polymer Grip, Side-Folding Stock, Adjustable Sights, QD Sling Mount $866.48
FN 3848950471 PS90 5.7x28mm 50+1 16" Barrel w/Ported Muzzle Brake, Matte Black Synthetic Bullpup Stock w/Thumbhole, Vortex Viper Red Dot $2,017.50