FWB 124d scope buster

[Dennis22]

I have a vintage FWB 124D that I have replaced the seal and spring with a JM kit. It shoots JSB 8.44g pellets at 800 fps

I have spent a lot of time trying to get it shooting to include bending the barrel where it needs less than 1/4 turn on either turret to bring it to center at 30 yards.


I have gone through 4 UTG scopes in the process, they are lasting about 2 tins, or less until they start to loose center


I just tried the Bulls eye ZR mount, with a new UTG 40-16 SWA scope  and I cant tell if it is the mount the scope or me but it is loosing center I get it sigted in at 30 yds and then next day it is 2" off, groupe size is also nearly double what I was shooting before.  I was consistantly gettin just over .5" groups and with the new scope and ZR mount it is well over 1 inchsome times worse.


Screws are tight


Not sure where to go, I am woundering if the Hawk Airmax 3-12 with the side wheel focus would be more robust, or if the new scope was loose before I shot it try number 5 UTG with the ZR mount


What kind of accuracy should I expect with the ZR mount, it is the new one


Help and sugestions

Dennis

[Motorhead]

It almost sounds as if piston seal fit is too loose   ARH does sell an oversize seal for those guns with slightly over size tubes.  My personal 124 was such a case ... standard seal gun shot violent tho still accurate. Pulled the seal and installed the O.S. seal ... THUMP !!

[Dennis22]

I took her back apart to check things out

There appears to be no damage to the front of the piston seal,it is a snug fit it has a little resistance when I push the piston all the way forward

The chamber measures 10.9 mm and the piston is 11.1 mm

I have about 2000 shots through her

I think it is a smooth shooting cycle no twang or vibration but this is the only pellet gun I have ever shot so I may not know what smooth is

I have a hawk airmax on the way, it may be the UTGs just did not hold up

[lizzie]

The UTG scopes I have had held up very well, but it's been a few years since I bought them. There could have been a decline in quality. I am surprised at the lack of accuracy though. Maybe the ZR mount? I haven't known many who have used them, but the reviews I have read seem to indicate that they are very good.
Let us know how it goes, and best of luck!

[Duckfish]

Seal doesn't look right to me.

[Motorhead]

Odd  in that the seal appears to have debris all around it looking like work away seal chaf .. also DRY & see no traces of lubrication being present ?

[Duckfish]

I will nickname that seal "Lefty" . 

Cause it just ain't right! 

[Motorhead]

dang my spelling su cks ... WORN AWAY seal chaf /debris

[Dennis22]

The seal is dry, I cleaned it for the photo

The chaffing is a little bur left from sanding the seal to fit, I can take it apart again and remove it.

When I reinstalled I did put a small amount of molly around the side of the seal and the rear of the piston

When I first installed I lubed the inside of the chamber lightly with molly and applied a heavier layer of molly to the piston and seal

Dennis