Quote Originally Posted by 303 Gunner View Post
I'm stepping a bit outside my knowledge here, but I would imagine it would be for the same general reason Britainicon hurried the No. 4 Mk I (T) into service: a lack of spare parts, spare scopes, and for that matter, new No. 3 Mk I's for conversion.
There was no new No3 Mk1 rifles or spare parts available.
The No1 Mk3 rifles were available and being built in Australiaicon including scopes. To my knowledge there was no tests done it was a straight replacement