Just to be on the safe side, with the hot weather we are having running 134a would probably be a good idea. It's a nice pistol and would be a shame to break it like I did with my m45a1.
Me: please make sure you put my VCRA defense all over the parcel - WGC: sure, no problems, give money - UKBA: Sir, your parcel does not have the supporting evidence of VCRA compliance, therefore, it is detained.