I didn't see them on a recent trip, but at one time the Swiss Guards at the Vatican used to have a sort of pyramid shaped box beside them. Tourists joked that it was in case they got short taken. In fact, it held a Beretta pistol and an UZI SMG; they had an underground range at the Vatican and an outdoor range at Castelgondolfo, the Pope's summer residence. Believe it or not, they also were well trained with their halberds and reportedly could use them very effectively.
I don't know what else they have today, but at one time, when not posing for tourists, they were armed and equipped as a Swiss Army heavy infantry company, with K-31's, which they later exchanged for StG 57's, as well as machineguns and anti-tank weapons. They have no illusions about defending the Vatican against an army, but see their mission as delaying an attack enough to give the Pope a chance to escape. That seems unlikely today, to say the least, but it has not always been so, and no one knows what would have happened if the Soviet bloc had ever invaded western Europe.
Jim