I am not up on the 5.45x39 but I am guessing that it is just a 7.62x39 that basically is necked down. If that is the case then yes it should just be a matter of acquiring a barrel and a bolt head for the 7.62x39 case (same as a PPC). You will most likely have to go aftermarket to get that bolt head. Sharp Shooter Supply or PT&G are the only sources I am aware of.
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