Get a Crosman "bugout" kit Carbine for about $90. Put a steel breech kit and Mellon Flat top valve in it and an LDC.It will drive a 14.3 g CHP at about 600 FPS- about the same speed as a .22 cal HW-50s.For less than $200 you'll have a US made, light, short ,quiet, accurate 12 FTLB .22 pumper.