When ammo prices return to normal you can buy bulk federal 5.56 x 45 ammo pretty cheap. A friend and I went in together to buy 12,500 rounds of Federal FMJ ammo for around 10 cents a shot. The ammo came in a 25 gallon drum. We flipped a coin to decide who kept the drum. I ended up making a run to ACE hardware to get a garbaga can. The ammo shoots great. If you take care of the ammo it will last a long time. I simply used sheetrock for dunnage. We both have had a lot of fun for the past couple years.