Are you looking for a local guy, where are you located? There are a lot of good smiths. Sounds like a magazine problem.. When these rifles are converted to belted round the magazines must be widened to allow the ammo to lie at the correct angle in the feed lips. Does it occasionally allow the round feeding from the left side of the action to pop loose into the action, then try double feeding or let it jump completely out of the action onto the ground? Any way tell us where your located and perhaps someone can help.