Some months ago I got an inexpensive used Maverick 88 for my daughters' apartment at college. Having stripped the thing, the trigger group (indeed, the entire weapon) seems near new with little usage, but right now, even with a variety of ammo, it is failing to fire 3 times out of 20. If I remember right from my old Mossberg 500, the rear of the firing pin ought to be able to be depressed (using your thumb) by pressing on the back so that you can, without pain, make the business end of the firing pin peak out the front of the bolt face. Either the pin is binding or the spring is too stiff because I can't do it without pushing it against a solid object. Anybody else had this problem? What fix did you use?