Thats a Viva Arms ZF41. And yeah, it was a bit of a bitch to get on, but a bit of grease and a plastic head hammer helped work it on. Solid as hell now though!
As for Internals, so far we're just going with a Zeta Labs CNC hopup chamber, We need the inner barrel still. Hoping to grab a PDI 6.03 off of the classifieds if the seller replies... I want to replace the O ring on the bolt but i'm having a hell of a time finding replacements handy. Everything else looks like its in working order, however.
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