Worst system (their wedge lock) - ZEV Technologies AR-15 Picatinny Wedge Lock Handguard

I bought the upper receiver awhile ago beause it was reasonably priced and ZEV has never let me down with my glock parts, so I figures their AR pats would be just as good, to be fair the handguard is beautiful nice finish, looks great. but expensive compared to the uppper receiver, I think i got the upper receiver for $120ish and the handguards are 250-300. First the first the handguard could barely fit the barrel (Ballistic Advantage Premium series) in it, with oil, I still had to tap it down with a nylon hammer. then you stick this tiny rod right above the gas hole so the receiver and guard dont twist. then you have to turn this screw at the bottom, to tighten the wedge lock which takes forever, then you put these two TINY screws in it also, you could be looking right at them and not see them they are so small.

come up with a different locking system, and make it a little bit cheaper. second make it a standard way to tighten the barrel nut, and not have to have a special tool, they include it, but its just another tool to lose.

besides that it looks great after you finally get it together,