I like how solid the M4E1 attaches, but handguard choices are limited and all are thick. Originally, I went with the 15" guard for the long sight radius with irons. No issue with the guard or bipod getting dirty on mine. Some people prefer it, thought I'd offer since you guys are looking for deals. As for tapering after the barrel nut, I've seen some monolithic uppers made that way and IMO, it's not a good look(if that matters). When i bought it, I had been reading so much about which way to go I finally just made a decision. Afterwards comes the second guessing. 😁