The MB74 is patterned after the original milled Bulgarian receivers but with the added feature of an integrated AR buffer extension.
** First samples of this receiver are off the machine and going through first article testing now (Dec 2018) **
See Photo Here: https://www.instagram.com/p/Brd7NElB_Ip/
Barrel is journaled to .866 after heat treat. Max interference between barrel and barrel journal is .002"
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