Gun #1: Ar-15, in standard 5.56 (ALOT of ammo can be carrier very easily, good reliable repeating rifle that is accurate and LIGHT, avalibility and price of 5.56/223)

Gun #2: Mossberg 590 or similar tactical shotgun (varity of shells can be used, availability and price of 12ga ammo, can be used for small game hunting if it came down to it)

Gun #3: Glock, Glock 17 for me personally (IMHO one of the most reliable pistols of its kind, also easy to carry alot of ammo for esp. with +2 base plates, who wants to have to change mags anyway?, availability and price of 9mm ammo)

I piked the above because its would be VERY easy to scrounge ammo and parts for the above weapons, though a rem 870 would have easier parts to come by.

OH, and,...

I realize this set-up leaves alot ot be desired in the long rage arena...but thats why camo is important, but not above being a sneaky little bastard ... and bring a big friend along that is up for lugging around one of those heavy m1a your all talking about