Well... I haven't even put my SP-1 back together in a long time, still stiting in parts on a desk in the basement lol. This has kinda turned into my 'magfed' thread.
However, thanks to the big Etha Modification I did, and talking to Jack at Planet Eclipse for a few years, I was graced with the chance at giving input for, and beta testing (or whatever you want to call a 3D printed paintball marker.) the upcoming MG100. This is based heavily on the EMEK/Etha 2, which is a gamma core marker. And if you are into the magfed scene at all you will understand extremely quickly how good this is when I say I haven't have a break/flip/jam of First Strike rounds in the 4 months+ that I have been testing it on the field. This is not what I would call a 'deluxe' marker, but it is the most reliably feeding marker I have used, and without a shadow of a doubt the most efficient with air. Between 180 to 220 shots of First Strike rounds which is seriously impressive.
I had to cover it up at games until recently, and footage of it is out there on the tube (just look up MG100 prototype).
Unless something terrible happens, this will be my go to recommendation here on out for anyone wanting to get into magfed. Should you decide not to, then you still have a fantastic hopper gun as well. Extremely pleased with the performance, very quiet sound signature and accuracy. I have been one shotting people at quite some distance, and am never worried about air, given the awesome efficiency. There are other things that I am testing as well, like the modified followers for sneaky dudes, and efficiency whores like me so it blocks empty shots from happening.