Thanks for the links, my son gave me those and a whole host more. 99 - affirm, but not really noticeable under most circs.
What I really want is just the panels to convert the external appearance from GR1 to 1A - SLIR/IRLS and blanking the gun ports (modelling putty, epoxy resin...my son has access to all this sort of stuff as a dental technician, including a 3D printer and the blessing of his boss).
Re SWP, I really cannot recall if it was permanent on GR1, obviously not an option on 1A.
Mister B