Hmmmmm
A good 45ACP, preferably in 1911-A1 format (Have Springfield Armory Champion, and a Ruger KP-90)
12Ga pump Mossy, Rem 870, etc (have Maverick/Mossy Mdl 88)
22LR semi-auto rifle (Have old Marlin 99 w/17-round tubular mag)
Semi-Auto Military Rifle (Have M-1 Garand, want a .223 format, maybe a Ruger Mini-14 or M-16/AR-15 variant)
Military Bolt Rifle (Have Mosin-Nagant M-44) want more old turn-bolt guns, like several Enfields, and Springfield 1903-A3's
357 Mag Revo (Have Sheriff's Model Vaquero, want 4"-6" GP-100)
Various 22LR pistols and revos, just for fun & cheap practice.
Truckloads of ammo & spare parts for each...an empty firearm is only good for a throwing weapon