Kid
I had mine at Shockwave. He didn't do much so Im not sure how much he gets into them. Also Blue Marine in Lancaster might be able to help ya. I can tell ya who not to use more than who to use in this area. Not many options in the Columbus area that I know of.
I don't think Sizzle does much with em.

Ok thanks I'll look them up.
I know one guy who's worked on Bravo's for a good while, just not XR's. He's got the tools, I have the internet.

I lost an XR upper because that nut backed off. Hard shimming is the best cure. At very least use a new nyloc nut with loctite and ping it with a hammer and dull chisel in several spots.

Thanks Mr. Gadgets, I just located sup 28 on ebay, now if I can just get into my paypal account....

Eastern HIlls Marine in CIncinnati