AR bolt catch help

[Stink-Nugget]

Need some help identifying this LR-308 receiver so I can find parts. Bought it as an 80% a few year back and now finally getting around to finishing it but forgot the manufacturer. It’s a DPMS style but it has a different bolt catch attachment scheme. Seems to retain from the side instead of the rear. Has anyone seen this before?

 

[ChrisAU]

That is strange. I can’t make out how it could even work without a pivot point.

 

[Stink-Nugget]

I know, me either. I have searched the internet for hours trying to find a similar configuration and keep striking out.

 

[JBradley500]

You probably already saw it but the closest thing I could find was some SR25 prototype that was still different from what you have. Can you just drill a hole or make a threaded hole for a more standard one?

 

[CodyAK]

Do you need a jig to finish milling the bolt release out? Comparing it to other 80 lowers. Looks like it was milled out too much unless it’s for a specific parts kit.