Putting +p through a gun not designed for it is fraught with hazard.
MY opinion only. I'm no expert on gunsmithing or engineering:
While I would be reasonably worry free putting +P SD ammo through it in a SD situation, I wouldn't plink with it every weekend. Of course if you damage the gun from excessive pressure, it's on you.
Is there even an actual spec for +p in a .380? (I presume it's a .380...) Or is it clever marketing on someone's part.
While searching for more info, I came upon this:
CAUTION: Magtech +P .Guardian Gold 380 Ammo - LCP Barrel burst