Keep what you have unless you plan on doing some serious abuse to the shotgun, than go with the metal trigger guard.
Is your 590 safety metal? If not than maybe replace that.
I have a 20" 590A1 and bought it over the 590 for the added features (except bayonet lug, I don't plan on doing a fixed charges anytime soon) but if I had a 590 I wouldn't add them later as they are going to cost even more than the original difference between the 590 and 590A1.
I would suggest saving your money and spending it on a white light for your shotgun, a side saddle (I like the velocro shell holders that allow you to tear off an empty one and quickly put on a new one) and maybe the KNOXX recoil stock.
"When governments fear the people, there is liberty. When the people fear the government, there is tyranny. The strongest reason for the people to retain the right to keep and bear arms is, as a last resort, to protect themselves against tyranny in government." Thomas Jefferson.
Bookmarks