You must have a staggerfeed mod 10 where the mag box stays with the reciever when you remove it from the stock. LONGS ARE 5.062 ,SHORTS OF THE OLDER STAGGERFEED ARE 4.275 AND THE NEWER ONES ARE 4.400. iF your smith could mill the correct hole spacing and ream the stock and aluminum for a larger custom pillar and epoxy it in and fill in the void. Yes it can be done period.
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