Since Buying the ar, I wanted to take a deer with it. (I have a bolt .223 that I have tried for a few years to take a deer with to no avail.) But the ar is enticing, Anyway, if you look at the price of magazines for the ar, you can buy a 30 round mag for about 1/2 the price of a 5 or a 10. So I talked to a few people that were familiar with the law and the general consensus was to "plug" the mag. SOOOOOO what I did was take a kitchen scrubber sponge (bought in a 3 pack for almost nothing) cut it to fit in the box of the magazine, and the soaked it in water. After that I let it dry out and it was rock hard. Shoved it into the bottom of the magazine and it worked like a charm. No feed issues and now it only accepts 5 rounds. I actually had to use 1 and a part to get it long enough but it works.