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I was wanting to convert my Glock 22 to a 9mm, but with a treaded barrel for a suppressor. After reading the different opinions on this barrel, I went ahead and ordered one. Dropped right in as described. No issues with the threads when screwing on the can. Several people have said that using the .40 GL mag created no feeding problems. Many said it did, along with the product description. Trying to cycle a full .40 mag, the 1st one chambered and ejected. The second one hung in the mag, in an almost vertical position. Several re-attempts brought on the same results. Using the recommended GL 17 mag, in my case, fixed the feeding issue.
I used a Lone Wolf threaded 9mm conversion barrel on my Glock 22. In the barrel description in stated a GL17 mag was recommended to remedy failure issues when using the .40 mag. Many reviews claimed the mag for the .40 would work. Upon trying it, like others had said, the 1st rd. fed right. But the second rd. would hang in the mag in a near vertical position. With the GL 17 mag, every one fed correctly. In my case, problem solved.