thought about a remington 870 pump for HD, has extended mag tube plastic stock, sling swivels, the recoil pad is hard would have to change it. anyone have problems with sling swivels pulling out of the plastic stock?and how hard to change recoil pad on plastic stock?with out stripping out the threads in the plastic ,how strong and break resistant is the remington factory stock if carry in a ex-tend cab truck in a sleeve that hangs on the back of the front seats?