RE: mossberg rifles
To put it bluntly the Mossberg 100 is crap.
A 12 year old could machine a better rifle. The action is incredibly rough, finish is poor, fit is poor. I wouldn't waste my money. I have said before I would rather have a Remington 710 than this rifle.
For about a hundred dollars more you can get the Remington 700 ($379), Howa 1500/ Weatherby vanguard ($388), Winchester 70, Charles Daly mauser ($349), Savage 110. Any of these will serve you much much better than the Mossberg rifle.
Mossberg makes a heck of a shotgun but stay away from this rifle.