This thing is hard to hold and press the ring back. Very hard. It slips, spreads, and generally is fussy. Also it does not grip the mag well well due to its glossy rubber coating. Also after installing one handguard, the rubber was worn away to the metal, and the metal was 100% rusted inside. This is on a brand new item. And the smell of the thing was so bad it stunk up my garage and I threw it in the yard. Not a pleasant rubber smell, but a rotten foul smell. However, with some struggle, I was able to get the ring pressed enough so it will get the job done, just not very well.
Pros: Cheap, will get it done in a pinch
Cons: Terrible quality, hard to use, ruins itself in use
This review was written in the old system and had content requirements that are different than reviews written today.