Arsenal (vice collection), as somebody posted, is a negatively loaded (pun intended) term the anti-gun coalition likes to toss into sentences such as:
Regressive, trigger-happy, right-wing gun hoarders across this crime-weary nation are surreptitiously stockpiling military-style assault weapons, multi-kill clips, night-vision sniper scopes, and thousands of deadly hollow-point dum-dum bullets, maintaining and supplementing their peace-threatening, lethal arsenals in a vaguely legal effort to make a last, blood-stained stand against reasonable measures designed to keep innocent women and children safe from gun violence.
I didn't lift that sentence from anywhere, but you can find many like it in the press.