I have a few AR lowers and the urge to build my own gun. I already have 2 AR's, one a 5.56 rifle and the other a 300blk pistol. I have access to a lathe and mill and would like to build a custom gun on one of the lowers. I am curious to hear what you guys have seen built on an ar lower. I am open to anything right now, I just need a project to keep me busy