486 Parallelo brunitura

[Hakan]

Hello everyone !
I bought a new Beretta 486 Paralello in 2017 and after 5 years of normal use the bluing(brunitura)is vanishing one certain places.The spots corresponds where I carry the gun with my left hand.Has anyone in this forum experienced this with a fairly new shotgun ? I will try to send photos of the defects…