Under the standard M4 handguards that come on the weapon we see that they are the double shielded style. When mated together, there were no visible gaps or ugly seams. Its hard to get worked up about handguards, but those people who have ended up with warped handguards that don't fit together correctly have a reason to be irrate. In any case, I have no complaints in how these fit, and they locked in tightly to the Delta ring while not being so tight that they were a pain to remove or assemble.