By the way, it is possible to convert a No4mk1 to .308 by changing the extractor, magazine, barrel and a few other parts. So, the No5 should convert just as easy? The Brits had these conversions in the works just before being force to going to the L1A1s (politics). Can you remember when the was the last time a politician told you something, you could believe? Their sniper rifles were already converted to the NATO caliber.