Lone Wolf Glock 17 extended barrel. Just received it in the mail Saturday so I've only had time to run a couple hundred rounds through it.
Installation was easy, it does literally just "drop in", no fitting at all.
I kind of expected perhaps a few issues with it but was pleasantly surprised to see none in about 250 rounds so far.
Make sure you get a thread protector for it also.
Been working on improving the range so shooting time on the trips there has been limited. Sometimes we have to work to improve things so fun time can be funner.
I'll be putting the Lone Wolf Barrel through it's paces more this summer, more to come.