Custom ammo cards, these are the loops from the ammo cuff affixed to a square of leather, just cut it to for your stock, pack, bag etc. 2-4 rounds of 308 or similar.
Normally these are screwed to your stock. These can be had with velcro stitched to the back if needed.
1-2 week turnaround on these, they are custom made for each order.
There may be a delay in the 2020 holiday season.