Remington 550i .22. Semi auto. Power piston, floating chamber allows it to shoot short, longs and long rifle .22 ammo. Mag holds 22 short, 17 long or 15 long rifle. 24 inch barrel. Made from 1941-71. Barrel and wood refurbished. Barrel was bead blasted and wood was redone. Bore is shiny. Integral scope mount milled into the receiver. Shoots great.