The Hoss covers off on some of the advantages of diversifying your arsenal in case of a jack booted thug gun grab.
We've been talking about diversification for a while here - pretty basic strategy, tough to implement at times, but an all around good idea.
He's also 100% spot on that a gun fight on your front door against a government or vastly superior force is an all around bad idea. Best case, you see them coming and get out of dodge. Going to war on their terms, time table and where their superior force can be brought smashing down on you like a hammer of doom is a losing proposition.