Impressed until i wasn't - FAB Defense GL-Core Impact CP AR-15 Buttstock

Researched this stock for a while before purchasing. Impressed with shock absorption technology and adjustability from Mil Spec to Commercial Buffer tubes. Once I got it the Commercial shims were installed ( opposite of what was described) I tried it due to my firearm was known to come with one or the other Buffer tube depending on production dates. Stock fit very sloppy so I tried swapping the provided shims. Extremely stiff retention tabs that broke when removing them so now it can never be used for a Commercial spec tube. After installing the Mil spec shims the stock was still loose....mainly from the adjustable locking lever and not the tube itself. For a stock crowding $100 i was not impressed with the fitment. The stock itself is made well but fitment is sketchy.