Lee enfield no4 mk1/3 US Property

[ssj]

The "P53" is probably F53 which should be a "no4 mk2" 5 groove military barrel, quite usual to be on a FTR'd gun I would assume. It maybe that the 41 is a barrel from mil surplus, in NZ that was common to import 10 barrels and then select the best ones for target use and repalce them every year, hugely wasteful....

Oh or the P53 is P58 and its a Pakistani barrel, (I have some p58 pakistani parts) I'd assume there would be pakistani proof marks?