Weapon X ... countered by ... Armor X
Its up to the GM what is the max value of X. While a sniper would be, say 5, one really can't have an armor 5 to counter it, unless he/she can lift and hold a tank or something.
However, armor is a loose term. You shouldn't just think Kevlar vest. How about a lucky charm? Since armor stacks, having a lucky charm of +1, a rabbit's paw key-chain for another +1, say a riot vest of +2 and maybe a horse shoe necklace for another +1 and there you go, +3 of that +5 armor has to do with plain simple luck (and lets leave it abstract), and the +2 is when the bullet actually hits you.
Ofc, a DM might say the items would go to attack, not armor, or at least nix you having any but one or two but its a plausible example.
And what I enumerated are NON MAGICAL items, lets keep the pure mortal pure now
Its the fact that humans believe superstitions are real give those objects power. Ofc not all superstitions work, but the most common should.
On another matter, having dark sunglasses should give you an aspect, to tag once free per scene, against accidentally soulgazing with someone. Declaring you have steel bullets with a Guns or Resources is also very much acceptable, you just have to put some effort in thinking it and keep thinking out of the ol' box.