I'd say it's a custom job. The parts look mixed (Kapp back block, Shocktech frontblock, custom vertical ASA) and I can't recall ever seeing one exactly like that before.
Does it have a threaded ball detent or a wire?
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Originally Posted by HurtCow
Old guns are more fun for me than new guns. I play paintball for fun. I don't play to win any more than I have sex to make babies.