Ive not been a vistor of the pistol section for a while but im glad I did now intresting read. I have a old 1377c the ones that came in the box instead of the plastic I think its around 4.7ft1bs with heavy pellets. I am at some point going to add a steel breach flat top piston and one of them brass scew cut front sight jobbies to it but the bank balance dont seem to be working out at the minute its always in the minus. Good bit of info thanks all