Well you all know I have a QB79 it's been a good airgun, it was good but not good enuff.
I had some problems with it, it was ripping the bolt o-ring I rip 7 in like 50 shoots.
so I send it to my friendly modded Pete, He made it a hard hitting airgun,

but after like 200 shoots it stop working I took it apart 7 time and on the 7th time got it to work,
but only for 20 shoots, so took it apart 2 more times and found the problem the inner valve was seperating.
Yes! the end part was slipping off the metal rod.

So now come in my friendly parts Seller Eric from Scopes & Ammo he sold me a new oem valve. [ and a few other goods but for a other post ]
I instaled the new valve with the new O-ring kit from S&A and put it all back to getter, clean,lube.
I tested it with CO2 and it work great.

now I got it connected to my 900lbs hpa air tank, it has not lost lbs of pressure in like 28hrs
so my work is done I will do a test on it tonight I will shoot it from 3k lbs to 1k lbs and count how many full power shoots I get.
after I will re pump it to 3k lbs and instal my scope and sight it in.

I'm very happy my QB79 is back I love this thing.