New to cockers , need help

[Dauntless152]

So I just picked up an Empire Resurrection. It’s absolutely gorgeous and fires really well and really consistent. But even with a pretty tall feed neck it only will fire maybe four balls and then it will fire just a blank shot. I realize it might just be my trigger control then I’m too used to regular semiauto markers and I’m not doing the full complete trigger pole. But the other issue is that when it does fire it sends a ton of gas up into the feed neck and sometimes pops off the lid of my hopper. I never really had a marker that did that so I was wondering if possibly the timing might be a little off or, it looks like there’s a groove for an O-ring on the front of the bolt that the O-ring is missing, but if I put an O-ring on there I feel like it would hit and wear a little prematurely the distance. If you’re familiar with the resurrection bolt it has those grooves cut into the side. Just wondering if any of you auto Cocker masters have any advice for me.

[latches109]

make sure the o-rings span the breach in the firing(forward) position

you can run 014 70D/ 75D orings vs stock 015 70D. I found ressy tolerances hit and miss.

[punkncat]

You are probably short stroking it under heavy fire. Common issue.

[Hellion360]

First, put your missing oring on the bolt.
A 015 should be correct.

Then, with no hopper on, load one ball and put another in your feedneck. Shoot that one ball and see if the ball in the feedneck flies in to the air. If it does, then you have blowback and should remedy it. Let us know how it goes.

[latches109]

the orings do not stop air from traveling up the feedneck - bolt alignment does, provided the bolt can catch all the air dumped from the body. Orings are marketing for poorly matched parts.

[TomDuece]

What Hellion360 said. Just got one and had blowback issues. Replaced all 3 orings with 015 and backed timing off a hair, fixed it.

[Dauntless152]

I just had a regular ASA O-ring and I threw that on there to see if it would work and I covered the barrel with a rag and I put one ball in the feed neck and I fired and there was no blow back. It was just the O-ring on the front of the bolt

[heyzeus]

You need to test blowback with a ball loaded. I don’t think a rag in front of the barrel will provide enough back pressure. Maybe try with a barrel swab stuffed all the way down.

[Hellion360]

Do it with a ball loaded and actually shoot it.
If you have blowback (and your bolt is positioned properly as shown earlier in latches109 post) you will have to widen the timing.