Works great, but not for all rifles - LANTAC Enhanced Full Auto Style .223/5.56 Bolt Carrier Group (BCG)

Bought a trio of these to try in my various rifles. They work wonderfully on my SBR with a 10.5 and adjustable gas block, both suppressed and unsuppressed, as well as on the 10.3 in 300 blackout that mostly runs suppressed. It does not work at all on my 18 with rifle length gas - even with the gas block fully open it was not getting enough gas to lock back properly on last shot.

So, as the description says, works great for a lot of rifles but not all of them. If you are running a longer gas system, be prepared to switch to a non-vented carrier unless you are also running suppressed.