The (new) Crosman Forum, your first and last stop for all things Crosman

 photo 63f5b325-0274-4312-9dbd-2effde5b3715_zps0x27orls.jpg

Alan Alford's build

2250b Tube for later move to bulk CO2.
12" .22 Caliber Barrel from Doomsday Backpacker
Brian & Assoc. Alluminum Breech with 2 barrel screws
Original site rear
Pin site on Custom Mt. Airguns Muzzle Break
2x1 Centerpoint Scope with UTG dovetail adapters
Mountain Airguns Custom Bolt and Handle
Mountain Airguns Custom Power Adapter and spring guide
B&A Boss Valve for extra Power

Built mainly for fun and to shoot at local Field Trial Pistol Match.

It currently it shoots a 14.3 Crosman Hunting Pellet at about 530 fps in a 72 degree room for 8.92 FPE.



 Return to Index  

Chuffed with mods made so far to son's 1077

July 11 2012 at 5:25 PM
Mark  (Login Specman)
Crosman Forum Member
from IP address 85.211.135.90

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.


 
 Respond to this message   
Responses

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