Just unpacked my stock. I had to apply a lot of force to get my ctr dbm in place. Once assembled, I have to shove the mags up in with force to acquire latch. Requires physically pulling mag free from the ctr dbm. The bottom metal inlet on mine, is def too tight. Makes me wonder if it was test fit prior to shipping. These issues should been noticed very easily. None these issues apparent in the oem ctr stock. This is a 223 ctr, I dont think that's make any difference.
Anyways, emails sent to UM, will likely be riding brown truck back to Idaho once return label is in hand. A few days short of 5 months from order date, to delivery........