I had to reply to this one sorry.
The No4Mk2 does have some nice features that the CNo4Mk1* does not however it certainly is not a better rifle. I have owned many of both models, all great reliable rifles however the one I still own is a CNo4Mk1*.
With regards to Ranger rifles and their condition...
If a rifle requires maintenance or replacement the onus is on the Ranger to report it to his or her section commander.
The section commander will report to the 2 I/C or the Patrol Comander.
From there the weapon with be shipped to the armourers for repair or replacement.
Try to remember that most of these weapons have seen a considerable amount of ammunition and at times questionable levels or care, cleaning or maintenance in a 60 year window.
The bottom line is - Will the rifle reliable cycle ammunition to take down a charging, dangerous or otherwise nuisance black bear accurately within 20m? This is what I train my rangers to do.
This is the only time a Ranger will ever truly require the weapon as a self defense mechanism. If the Ranger is a shooter of competative nature then he or she needs to speak up and get the rifle replaced. Not all Rangers are interested in shooting - period. They seek the out door wilderness experience. The rifle is assigned simply because its part of the kit. Thats an entirely different story that I won't get into here.
If the Patrol command structure is dissengaged and frankly lethargic towards the material effectiveness of their Ranger's gear then the 2 I/C and the P/C need a flogging. These are the Patrols that cannot recruit or retain good Rangers.