Originally Posted by
TonyL
My 1377 "mini-carbine" is based on a 2009 version. Just the Crosman steel breech, shoulder stock and 4x32 scope. Left on standard barrel as it's only for short range use at home. Pellet on pellet accuracy. Love it. Wouldn't mind building a longer barrelled higher power version, but always been a little hesitant due to pistol origins....some say it's okay, some say, "once a pistol, always a pistol".
Always also fancied trying a flat top piston, mainly for the efficiency but also because the rod part is more heavy duty?
JB, what tubing do you normally use to ensure better TP sealing?