So I needed a upper receiver block to change barrels, receivers and what not.. I came across this one, and it looks like a gem to me. Even doubles as a bore guide for cleaning rods. Cnc machined aluminum? $25 out the door shipped. Cheaper than the junk out there on the market. I like solid, not hinges, plastic, yada yada... Ill provide feedback once I use it if anyone is curious. Found it looking at youtube videos of it.

