First Mag, bolt sticking?

[newmagman]

I purchased a mini mag on ebay, first the valve wasn't assembled right, took some time but got it figured out. and now when I fire a few shots slowly it's fine, but if I fire alot than the valve is sticking open and it's leaking air out the end of the barrel. I have oiled the crap out of it, but can't figure it out. it's my first mag so any help would be great

[Surestick]

When you say the valve is sticking open you mean it's sticking in the forward position?
If you hold the trigger down does the leaking stop & does the bolt retract?
Are there any scratches on the bolt to indicate it's scraping on something?
Does it do the same thing if the barrel is removed?

[athomas]

Replace the bolt spring. A worn bolt spring will cause the problem exactly as you described.

[newmagman]

Thanks for the help, I will give it a shot. can I get a spring any where other than air gun designs?

[Migz]

Sure you can get them from Tuna @ Tunamart.com
or the Magsmith @ The magsmith .
You may want to play with the adjuster in the back I noticed mine did that to and had to play with the adjuster to get it right also it did this more when I was getting low on air.