The kimber 84m .223 action is easy to get some extra length in the mag box as it’s the same length action as the 308. There is a spacer block you need to remove from the mag box shorten it up then weld back in. You then also need to modify the blade ejector to work with the new length of the mag box.
I have a 84m kimber set up in .223ai shoots 75gn amax around 2900-3000 21” barrel
I think I opened the mag box an extra 5mm
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