I have 3 rifle/scope, .22, .22/250&.243, all are fitted with BC covers, all are over 10 years old, all get regular use and all have been faultless. I guess the newer ones are not as well made? The one on my. 243 became detached once as i took the rifle from the slip and dropped into the lane where I had parked my truck, i noticed it was missing as i chambered a round, when i got into the wood, i found it when i returned later that evening after the stalk, it had been run over, but was still intact, i soaked it in boiling water for a few mins, reshaped and refitted it, still on the s&b to this day, all be with black insulating tape to ensure this doesn't happen again.