Hello people. There is a question. (Grand Theft Auto 5)

So I played in GTA online, nothing special happened, then after a while I noticed in the selector it was not clear from where, an atomizer and a plasmatron appeared, I myself only bought a laser auth. and I did not buy them. You can't reset them, they seem to be bought in ammunition, but I didn't buy them, where did they come from ?? I did not notice anything unusual during the game, from the last one I bought it Dump, Alkonost, and Jetsam ... Tell me what kind of phenomenon is this please.