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So far I took your advice and I added a slightly smaller diameter spring into my stock hammer spring. I could tell right away that fps was up and also I have a very good suspicion that now the valve open for a tad longer when I take a shot. Very noticeable difference! I haven't gone any further...

Hey do you know,can you convert an fx impact m4 from 30 up to 35? I know you can take the 35 down to the other calibers. But I'm wondering if like I said, you can go up with em ..

The GUNNAR is the NYX lol, so it wasn't really nixed was it? Or was it?

Two more small questions for you, what spring or type of spring should I be looking for to use for the hammer spring and where would I begin looking at plenums for that rifle?

Thank you!

So with the tuning instructions you've provided me, what's the low side potential fpe this thing would be looking at?

Dude you are awesome. Thanks so much.

Sir. That was an absolutely awesome and generous response. I very much appreciate your sharing of knowledge. Here is my issue. I am new to airguns, I run chainsaws for a living and this is far from that. I'd like to tweak my Gunnar to pull out some fpe's if possible. Are there things I can do on...

Can you explain a little more about drilling the ports? I have a Gunnar. Just interested and curious here.

It does

I have one. I like it. But I can find no support or parts. Any body know anything?

Exactly which impact version is this conversation pertaining to? MkII, M3, or M4? Thank you so much

Scott do you know anywhere that you can get parts or support for this gun? I bought it about two months ago and Benjamin doesn't even have it on their own website anymore......