The NcSTAR AR15 Handguard Removal Tool works very well on 5.56mm/.223 Rem AR-15s with a standard magwell. It makes removing the handguard a 1 person, 30 second project. It doesn't work on a 9mm AR-15 due to the 9mm Magazine Block that makes the magwell smaller to accept 9 mm magazines. If you have a AR-15 in 5.56mm/.223 Rem and need to remove your handguard, buy the NcSTAR AR15 Handguard Removal Tool. There are more expensive ones out there but they aren't worth the extra money.
Pros: Lightweight, inexpensive
Cons: Doesn't work on AR-15 9mm Carbines
This review was written in the old system and had content requirements that are different than reviews written today.