Anyone having trouble keeping the front sight base on their carbine tight to the barrel? I've tried Loctite to no avail. I ended up overtightening the two grub screws and split the sight base. I tried to purchase one from MOM but like usual, MOM refused payment and sent me one for free. I like the 4595 carbine but this is driving me nuts. The sight usually works loose after about 1 box/50 shots.