I sold my 870 several years back and I finally have a 12ga in the safe again. I decided to go with the Mav 88 as I actually like the location of the safety as opposed to the Mossberg 500 families. I would have preferred to the 18" barrel to the 20 I got but the price was way too good to pass up. I do have some light gun tinkering experience and would like a top rail for either a red dot or ghost ring sight. How easy would it be to drill and tap myself? A video guide would be helpful as well. The LOP is just a little too long for my short arms. I will be looking into either cutting down the stock or getting a 12" option. The magazine spring squeaks. Any way to lubricate the spring, ideally without taking the tube apart? I would rather not mess with that spring if I don't have to. I will probably have a few more but this is good enough to get me started working on it. Thanks in advance.