I have a good bit of experience with the GM22 Gemtec. I like them. They are light weight and disassemble easily if you don't do stupid stuff. If you get one .........you Absolutely Must spray the threaded sections with lithium grease before each use. This will ensure you can still get it apart after fouling. We had a couple that we could not get apart and I called Gemtec. Tech support said to use the lithium grease and, on the ones that I could not disassemble, they said shoot to fail and then send them back. These cans are quiet when using subs on a bolt gun. Like most cans though, they respond differently when on a semi auto. You may need a more robust charge to get a full cycle.