Umarex Glock 19 to 1/2-20 UNF Adapter

The adaptor worked, but I wasn't sure how to install it, and the package arrived with no instructions, so I was on my own to find a youtube instructional video. The small clip didn't extend all the way over the front sights and you had to bend it down over an edge of a table or work bench, hard enough to get it on there sturdy enough. Seemed kind of gerry rigged. In the end, the suppressor screwed in just find, but now aiming is a bit challenged. I wouldn't enter a marksmanship contest with it on. I can however still hit a target.