Get one KG then have it examined by someone who's competent to do so, then take it AND the examination certificate to the proof house who will agree with what's been said 100% and issue you with a letter to that effect BUT that they can't certify that it's deacted to the HO spec but that it is totally incapable of blah blah blah AND that the specification actually exceeds the laid down spec...........

Then take the paperwork to your local plod and request that in the light of the proof house opinion and the the UKicon MoD fact (we only deal in facts your honour......) they remove it from your FAC.

The problem as I've heard is that there are some 'L59's' that are simply purporting and dressed-up to be L59's. But unless they conform to the last EMER, they ain't. This thread isn't going to die. But the answer is simplicity itself

As the great Mr Kalashnikov told an Engineers Conference. '............it's easy to make things complicated. The difficulty is making complicated things easy'. I wish I'd invented a) that saying and b) his rifle