Gunsmithing .223 into 5.45x39 bolt action rifle?

Re: .223 into 5.45x39 bolt action rifle?

Or you could get an ar 15 extractor for the 5.45x39 and open the bolt face. I have read that the 5.45x39 cartridge feeds fine in the older 20 round straight mags, without having to buy the 5.45x39 specific mags. So I would think the mag box for the 223 would work also.