3000 psi tube QB78

[rsterne]

Following the shot it sounds like i have a load of air traveling through the barrel after the pellet has left.

If you can actually HEAR the air escaping separate from (ie after) the sound of the shot you definitely have a problem with the valve hanging up.... Even with the lightest of valve springs, the air pressure should shut the valve with anything like 1000 psi in the gun.... I'm guessing maybe you bent the valve stem or it's got some dirt/chips making it drag.... On PCPs, I have found them to be relatively insensitive to valve spring changes, but VERY sensitive to hammer spring changes....

Bob

[remtom1200]

After adding a little more preload to the valve spring this afternoon I pumped to 1800psi and listened carefully as I shot. Valve is staying open too long and I do believe what I am hearing is the echo of all kinds of expanding air coming from the barrel. I also believe what your saying rsterne is true about the hammer spring and I got too excited to add a spacer of 3/16 before trying it without. You know it sounds like i am shooting with a 10ft piece of 2'' pvc pipe on the end of the barrel along with the crack. Now if only there was an easy way to pull that spacer without disturbing the breech seal and barrel o-rings.

[remtom1200]

See what happens Sean when you show me functional bling?..lol I contacted al and he so kindly provided me with his cad for his power adjuster. I happen to like brass so I added some to my version.IMG_0411c.jpgIMG_0412c.jpgIMG_0413c.jpg

[Gippeto]

Al's a nice guy isn't he.:)

Nice work on the adjuster, looks real nice.

Al

[remtom1200]

so im curious what type of material is used in such an application?

[SeanMP]

PM AlStone on

www.airgunhome.com

[Mudbug]

Thanks I will go check it out !

[remtom1200]

I contacted Al through the forum Sean posted a link to and he sent me the cad. Its not mine to share so its best to pm him on there. That adjuster is the cats meow!

[Mudbug]

I contacted Al through the forum Sean posted a link to and he sent me the cad. Its not mine to share so its best to pm him on there. That adjuster is the cats meow!

I understand ......with a great cad comes great responsibility !

[remtom1200]

Micro fit stock? I am not sure if I have seen that must take a look around