Jp makes quality products.
When I received my jp adjustable gas block i was impressed by the product and packaging. It has a very nice even finish, good looking hardware, and proper fit. It comes in a nice package with the tools you need for installation and instructions. There was a small burr in one of the tapped holes, but it was easily removed and the set screw threaded in fine. Other than that I can't find anything remotely bad to say about it.
Reviewed by: Joe from Ohio on 5/30/2016