Tom West's Custom PC77 PumpMaster Classic Short Rifle
Chuffed with mods made so far to son's 1077July 11 2012 at 5:25 PM
|Mark (Login Specman)|
Crosman Forum Member
from IP address 220.127.116.11
We got the gun last week and soon found that it was great fun to shoot but peppered the target like a shotgun.
So after a major CO2 leaking problem it was in bits, whilst I was in there I thought I would tinker. Here's the current mods, mostly to improve accuracy.
The black spring-loaded assembly (the 'detent body') at the front of the valve drilled out to 4mm, installed an O-ring into the obvious slot on the outside rim the plunger, makeing sure the O-ring didn't bog the plunger- but sealed it somewhat. I need to fit a stronger spring in here also but didn't have anything handy. I'll get that next time.
Stablized the pea tube barrel with polystyrene inside the shroud
Lubed and greased up the trigger
Re-crowned the barrel
Lubed the barrel with Dryslide
A few more bits and pieces to go, but its now shooting tight half inch groups, 632ft per sec at 9 degrees C. 48 shots to a bulb.
Crosman Corporation 1-800-724-7486
This forum is not affiliated with the Crosman Corporation in any way// Information presented in this forum is intended for informational purposes only; use at your own risk//Posts made to this forum are soley the opinion of the individual member