As I look at the NRA Marksmanship Program catalog, I notice that pretty much things seem to jump from .22LR straight to full-length 20" Service Rifle. Are there any disciplines other than 3-Gun with formal competition in the 14-16"-barrel range where the GF and I can put my M4 and her C8 in play, or am I gonna have to bite the bullet and build us a pair of M16-length uppers?