I purchased a Pars Maadi with a cruchfolder a few weeks ago. At the time the seller said the barrel was threaded and it had a slant brake on it. I received the rifle and I was shocked to see that it in fact had a threaded barrel so I thought I had something that may have slipped past getting turned down. I took it to the range and shoot it and about 20 shots down I noticed I had no muzzle brake. I found the slant brake on the ground and saw this...... I have never seen anything like this before and was wondering if anyone knows anything about it. Basically it looks like a threaded sleeve that went over the turned down muzzle and glued it on so that a brake could be threaded. Apart from being unsafe, I thought it was kind of clever. I have a micrometer coming in the mail today so Ill check to see if I can turn it down to 5/8 soon. Thanks for any info ya'll can provide.