Doesn't lock rotation - Luth-AR Grovtec Base/Cup

This is fine if you're ok with the sling swivel rotating fully. It bugs me but it's not a deal-breaker. I already have the stock so I'm stuck with it. It works, but I haven't put it under heavy use yet. I could see some issue with it's installation method of screwing into the plastic of the stock instead of being secured with a screw like the Magpul swivel cups but that's conjecture only. There wasn't much info on here or any reviews, so maybe this one is helpful.