We were reading about the AR's original twist of 1/14 on Weaponeer.net, and fell into a discussion of the ideal twist for M855. Rudison on ARFCOM sent me over here. I'm also the editor for the Feinstein Project, which is an attempt to design and build a working AR lower from children's plastic toy bricks, such as Lego or MegaBloks. I'm afraid my theoretical interests exceed my trigger time.