This is a very well designed and built back up sight. It tucks down flat and pops up when needed. I did not realize it should not be used on a gas block until after I opened the package and read the fine print. Looked at other online reviews and some said they have the potential of melting due to the heat generated. I ended up obtaining a metal LMT sight for the front. Other than that, it seems like a great item. Just not for my set up.
Pros: Easy to install
Cons: Can't be used on gasblocks
This review was written in the old system and had content requirements that are different than reviews written today.