Talked to CMMG yesterday after (finally) saving enough to buy the upper I wanted to finish my lower and imagine my surprise to find out that my lower is completely out of spec. To respond to the Magpul PMag issue and tolerance stacking, this is a true fact, and also there seems to be an issue with the bolt catch. The Issue does not stem from the bullet button at all. Busted out the micrometer today and detailed exact specifications of just about the entire lower now to see what exactly is changed when the milling comes back but am seriously not happy with this experience with what I used to consider a respectable company. To be fair and honest I sent CMMG quite a bit of business because of my experience with them and 556 rifles but am now totally soured. The response of "yeah quite a few of our early receiver's have the mag and bolt problem" delivered with an air of nonchalance kinda burned me. Especially since they refused to issue me a call ticket for what is obviously a known problem that slipped their QC on more than just a few if the solution line is commonplace. good luck getting anything else out of me and my friends. sorry to rant but just reaffirming the speculation about the mag/BHO issues. note: CMMG noted that the way to tell the difference is that the finger shelf on the older lowers (relief cut into the lower) looks like an oval fingerprint indention while the newer lowers will have a square cut. good luck if you have the problem.
