im looking at buying a youth axis 223 for my son to start deer hunting with but I am wondering what is the difference between the youth axis and the adult axis other than the youth model having a 20" barrel and the full size having a 22" barrel, is there a difference in the stocks? basically im wondering if it is possible to convert the youth model into a full size model when he gets older and out grows the youth size gun, any info would be great thanks