BCA has complete uppers in stock, but they are BCA.
Fixed that part for ya.
I found it interesting that Craddock claims standard 5.56 magazines will not feed correctly, which is a surprise given the cartridge is just a blown out 5.56.
The ribs in 5.56 magazines are intended to contact the 5.56 case at the neck - a .35 cal case contacting in the same spot causes the rounds to go pigeon toed in the mag. The same issue occurs with some heavy bullet 300 Blk loads (especially straight nosed cast bullets) and other large caliber wildcats like my 358 Herrett. A solution is to remove the ribs; on metal mags I mill out the rib area, and on Pmags you can disassemble the mag and file down the ribs.
Of course, the 300 Blk Pmag has reduced ribs for this same reason, and might work with the 350. If not, you'd have to file the ribs down further.
