Tronny,
Thanks for your honest answers to my nosy questions.
Sorry to hear your new shotgun is having digestive problems, I hope they get it fixed and back in your hands very soon. I don't know what the turnaround time is for factory support, I have heard from other folks that Mossberg is making real efforts at doing a good, fast job on warranty repairs these days.
Please consider some (free) advice from an old stuck-in-the-mud shotgunner on your situation. I am NOT trying to pick on you, only to help, with what I consider to be a genuinely serious subject.
The first piece of advice is to replace the pistol grip with a conventional shoulder stock, preferably one of Mossberg's Bantam stocks if you or your girlfriend need the shorter length of pull- and most folks do better with a too-short stock than a too-long one. Any halfway decent gunsmith can shorten a stock as needed to fit a given shooter. The overall length of the gun will not be increased enough to make any real difference in handling the gun inside, if you're doing the right things with it. Our house guns here, set up to fit my 5'4" wife, are right at 37 inches long overall with an 18" barrel and a 12.5" length of pull. Knowing how to handle the gun indoors is the key. More on that later...
The second piece of advice is to have a premium recoil pad installed on your short or shortened shoulder stock- a Decelerator, Limbsaver, KickEez, Remington R3 or the like. That makes a lot of difference in the gun's shooting comfort during practice sessions. Proper fit and good form make the most difference, but a good pad helps a lot too.
Third piece of advice is to get some training. Some lessons from a friend with lots of shotgun trigger time might be good, or a hunter safety course, or better yet the NRA courses on shotgun, personal protection and home firearms safety. Take a look at
http://www.nrahq.org/education/training/basictraining.asp and see if these classes are available in your area. Ask around at gun shops in your area and see if there is any training available that anyone knows about.
Fourth- Learn to shoot your shotgun first. Pay attention to the owner's manual, pound the rules for safe gunhandling into yourself all over again. Determine which is your master eye, if you don't know already. See the thread at
http://www.thefiringline.com/forums/showthread.php?t=217593 to learn how to determine that. Get some dummy loads to practice loading and unloading with- if you have a friend who reloads, ask them to make you up some dummies, or have your gun shop order you some. After you learn to shoot your shotgun- loading, unloading, making safe, mounting, tracking a target and firing, learning to run the bolt every time after every shot so that it gets to be instinctive, and always being safe no matter what- then start learning to fight with a shotgun. It's a different skillset than just shooting, though it incorporates a lot of the things you learn while learning to shoot. But get the basics of ordinary gunhandling down pat first, then start working on fighting skills. Don' get the cart before the horse.
Fifth- Let me invite you across the street to TFL's sister site, The High Road, at
http://www.thehighroad.org . Specifically to the Shotgun Forum there, most specifically the Lending Library at
http://www.thehighroad.org/showthread.php?t=207361 . Now I am not trying to hijack you away from TFL, but there are lots of us who wander back and forth, and you can do that too if you want. Join up at THR, give RM a chance to get through with the Louis Awerbuck _Combat Shotgun_ videotape that's part of the library, and ask him to forward it to you when he's done. By borrowing it you obligate yourself to send it on to the next THR member who asks for it, but that's all. I know you can't get all the benefits there are to hands-on training from a tape or DVD- but there are _some_things you can learn that way. If it encourages you to get some face-to-face training from one of the many excellent trainers working in the US today, so much the better.
And last- encourage your girlfriend in every possible way to learn to defend herself. Make it as easy for her as you can. Check out
http://www.corneredcat.com/ for some insight you might not otherwise get into some of the things involved in that.
Take care of yourself, and Stay Safe,
lpl/nc