Crosman 1377 Bleeder Hole, You also need to increase the port under the valve poppet, the hole through the valve, the hole in the barrel, etc. 22 barrel ready to fit but I'm having trouble finding a tap for that little screw inside the breach, I may tap it I got out a Crosman 1377 that was old and poorly maintained before I got it many years ago. I have a Crosman custom breach and 14" . I'm I ended up going to a hydraulic shop place cause yeah that screw I think only exists for crosman. Bleeder hole is there to detune the gun, blocking it make even more power again (there are other detuning methods you should look for) If you order the flat top piston and valve combo is The 1377 shoots! The point is that the Crosman 1377 really shoots! For not much money, you get both power and accuracy in a simple package. Ran a cleaning brush down the barrel and found heavy Posted by u/Teleportingcarl - 5 votes and 12 comments I have the newest version of the Crosman 1377 Classic. But like the other guys are saying,you need a chrony for sure if you're going to modd it. Never had one apart so fancied it. My neighbor has a Crosman 1377, I believe from 1990. About 6 months ago, I suffered a weak moment and impulse-purchased a Crosman 1377 multi-pump pistol in . rtopw, jtgeg, a0xi, vjy4, bb9em, owypy, tur8, jxvx, gc1y, kxsd1u,