The Salient Arms International metal outer barrel will give you that support and peace of mind of having a sturdier and stronger outer barrel (please note it has a threaded tip).
If your looking at upgrading your P1 then this is one of the main bit of kit most enthusiasts opt for especially if your getting a metal slide.
Beautifully machined, these barrels will make your pistol the envy of your friends. Go full black with this outer barrel and make your pistol look tacticool.
Please note this is only for the metal barrel not the pistol.