If you're talking "game gun" as in hunting weapon, I suggest you think again about the Bushmaster. There is a guy here that will tell you a .223 will drop a grizzly bear, though he never did prove it when asked to do so. Just about every state's Fish & Game department will tell you otherwise and you cannot hunt deer or larger with a .223 legally. Plus, in most states, if you use a semi-auto centerfire for hunting, it cannot hold more than 5 rounds which means you have to have a 4 round magazine (some wardens will take the bent that a 5 round mag allows for one in the chamber, thusly making it a 6 round capacity and thus illegal to hunt with.) Anther thing is that many game wardens seeing an AR are going to stop you to inspect it for mag capacity. Don't forget that having a loaded 30 round mag in a separate pounch, or in some states, even in your vehicle while driving to the hunting area, is still a violation of game law. So why bother when there are much better rifles in much more effective calibers for hunting? Now, varmint hunting is one thing. Yes, an AR is fine for that. But for big game, you might want to be setting your sights on a lever action .30-30, or a Ruger International in .308, or a Remington pump action .30'06 or a CZ fullstock. For small game up to rabbits, big possums and racoons, anything over .22LR is just wasting too much meat. There are more .22LR carbines than you can shake a cleaning rod at. Another nice option for a game getter is a combination gun with 12 gauge over .308 or .30-30. That'll drop everything into the pot or onto the barbeque grill.
