16 inch barrel AR15 with flat top and iron sights,, collapsible stock, a quad rail with a red dot or eotech scope on a 45 degree rail adaptor, a forend pistol grip and a single point tactical sling.
Two 45 acp caliber semi auto pistols. Make isn't important but they have to be the same make. One to be carried in a thigh rig using a Serpa holster, the other in a vest holster. (I'd prefer Glock or 1911).
12 gauge Mossberg 500 or Remington 870 shotgun with 18 inch barrel, extended mag tube, tactical butt stock, buttstock round saddle and round saddle on receiver. Carry slung on back until needed.
A decent knife, preferably a Bowie style. mutliple magazine holders on tactical belt. Extra 223 mags in tactical vest and a waste pack containing extra ammo for all guns
Anything that the military is currently using.( it will make it easier to replenish and scavenge ammo). A-A12 automatic shotgun, M5 or M6, used by DEA and INS, HK, Smith and Wesson 9mm, Anything in the .50 cal range, The new IAR the marines are using. Most of these have carrying straps or can go on your waistband.