Tuning Wildcat 3 mistake already

Thanks everybody for the help.

I have a new question. I see no difference with or without the donnyfl. I went through 3 magazines today and it seems to be working correctly. But it seems very loud whether the donnyfl is on or off. When I fire it the noise seems to be popping out near the rear. I took the magazine out and dry fired it and I see a blast of air puffing out where the magazine fits. Is this normal or do I have a problem of some sort?
 
Got my o rings. I watched AOA video on replacement.

Do I need to release air for this chore? The video does not say I do neither did Chrisis’s excellent description and the pressure gauge looks to still have plenty of air but I just want to make sure.

Are there any other things I should look out for? It looks like a pretty simple job. 
Should I lubricate the o ring?

Thanks for all the responses




 
Thanks everyone for all the help. The barrel came out just like you said. I found there was no o ring in the groove inside the bareel. Probably why it was so loud and blew air out the breach. I am sure it happenned when I pushed out all the jammed pellets.

The hardest part was gettin the new rimg in the groove.

it is all fixed now. Thaks again for all youraccurate help.