Hi thanks for your reply.
The rifle still has the gml parts that were fitted at time of conversion, its just been shortened technically. From original spec i have only added a Rowan trigger blade and guard. The cylinder length varied depending on what base rifle you gave them or specified at the time (fac cylinder/classic barrel or classic cylinder/carbine barrel and one or two "stumpies" were made) I knew Mick and Lee well and had 4 GML rifles coverted by them 2x S400 and the only 2 S410 GMLs done.
I still see this as genuine GML personally but appreciate your info/valuation.
Pete