I was at the Dells for a bridge dedication at the little railroad where I used to work. I'm back home now, and I unpacked my latest SOG M53 kit, and it's even nicer than the one I already had. It's got a really nice barrel.
Here's a photo of the IMA receiver parts. It's cut in the best locations it probably could be, the "important" holes at the rear are all in one piece, and the hole for the front of the recuperator is there too. That should make it easy to set the overall length by just bolting in the grip mount plate and recuperator.
The "ratchet" plate isn't messed up too much either. Like somebody said, it doesn't "ratchet" anything, I suspect that the "bumps" are just to cut down on the friction of the cocking handle rubbing on the side of the receiver
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