I was reading an NRA booklet about "British Enfield Rifles" which had a few paragraphs advising that firing the Number 4 rifle could be hazardous. The claim was the British MOD had some rifles blow up. The apparent cause was "severe craze cracking of barrels". The warning went out in july 1987. Is anyone aware of this and does it affect rifles from all factories? I have a pretty nice Number 4 Longbranch rifle and would like to know if I should be concerned about this.