Thanks jw. I found, and looked at some Storm Lake barrels that are extended, and threaded
for the glock 17 and 19,and since I heard the sigma's are very similar in design,
I was curious if anyone could tell me how much differencen there is between them.
I haven't looked closely at his barrel, but he has told me there are minor differnces
between the two. Anybody know for sure if their interchangeable?
Oh , BTW sirk, check out stormlakebarrels.com