There was another thread on another board with a gentleman who made a .95 rifle and some posters said he needed to have the rifle registered with ATF as a destructive device because it was over .50. I figured if anyone knew it would be you guys as some of you have rifles over .50. Now this doesn't have to do with the rifle it'self as that is all legal but to the size of the round it shoots. Any help would be appreciated. thanks.

Edited to add a link to the thread so you can see the round and rifle
www.ar15.com/forums/topic.html?b=8&f=14&t=177121&page=1