Just got my first QB 78

Seems to be a nice solid gun. I had it all apart today to check it out and to do a few mods. So far I have only one issue with this gun. The set screw that holds the barrel and the one that keeps the bolt handle tight seem to be a bastard size. Neither metric or standard. Any one else had this problem?

[jonny1o1]

doesnt the gun come with the allen key?
and will you be posting chorny numbers of your valve doc?

[leftcoast1]

I like them as well. I like them so much I bought one converted to PCP. I like the weight and the feel of the gun.

Nope, no key came with this gun. I have several sets in both metric and standard but none fit.

Not finished testing my modded valve yet.

[jonny1o1]

doc, assuming you got it from dan, id say shoot and email his way and ask what size i is or ask if he has any for you

It's a standard M5 metric Allen screw so a 3mm Allen key should fit. When I have one where I can't get a key to fit I gently grind down three sides of a slightly larger Allen key until it fits.

Jon

,,, grinding 3 sides is a new trick to me. I will have to give it a try.

Portland Jon - 8/26/2007  3:51 AM



 

It's a standard M5 metric Allen screw so a 3mm Allen key should fit. When I have one where I can't get a key to fit I gently grind down three sides of a slightly larger Allen key until it fits.

Jon

The +/- tolerance and heat treating consistency leaves allot to be desired.  We could end up with a Chinese Whitworth set of allen keys in the end ;-).

Cheers
Mark

[johncedarhill]

I saw in the manual reference to a 2.5 mm hex