I just bought a new Maverick 88 security, took it out and fired about 20 rounds of slugs and buckshot and it shot and functioned great. However after cleaning and tightening the barrel nut back on, I noticed the stock moved slightly. This is a brand new gun and the stock is loose, could this be a defect or normal? what type screwdriver removes the pad, should I use blue loctite on the bolt and what size is the bolt in the stock? Thanks for any help.