Perfectly realistic list.
1. A single Glock 17 with Laser Guide Rod.
2. 4 standard cap Magazines filled with rounds.
3. AR15 with 6 Magpul PMAGs, Aimpoint CompM4, and Magpul AFG or Composite Vertical Grip.
4. Three point sling for AR15.
5. Backpack with some water in food.
6. Car, spare gas canisters, food and supplies within it.
All of those items are easily available, I don't actually have those items but, the list is still believable.