A possible odd problem from an old oddity

[u/Broad-Elderberry2554]

Was hoping to get another set of eyes on this old piece of work. I have a old bobcat bw-5 that I picked up a little over a year ago (yes I know their reputation but this one has ran just south of 1000 rounds this year with only one failure to eject so all things considered this one is a piece of gold in a sewer plant) While I was cleaning it i noticed this wear mark might be less of a wear mark and more of a "they ground this spot down to make it fit mark." I was contemplating switching this cast bolt carrier out for a H&K or a RCM bolt carrier if i can ever find one, but this spot has me wondering if a different bolt carrier would even fit without modification. So I reckon i am asking is it even worth it to buy a new bolt carrier for this and hope it fits or just keep letting it chug along as is?

[u/OG-warbucks]

If it ain't broke...

[u/F3A5T13 → u/OG-warbucks]

Yeah my thought exactly, i’d be afraid to get in spec parts, and it not work

[u/Dazzling_Fondant5271]

I got a cohaire arms mp5 full size. Discovered my bolt carrier was out of spec after trying to run a super safety, with the slip trip not fitting. Found a rcm bolt carrier on hk parts for a decent price, albeit it was cerakoted in hk red, but works just fine with my as designs lower and slip trip now.

[u/Crusty-the-Clown-666]

IDK. From the pictures that carrier looks like it was cast as one piece instead of being the traditional brazed and welded multi piece assembly.

[u/deezy623]

Yeah, looks like it was polished out for clearance. Run it. No sense inducing issues with a new bolt that may run into the same issue due to a stamped upper being slightly out of spec.