BSA Airsporter S model numbers.

[WILBA]

Thanks for that Max, I've been doing a bit of Google searching and it seems (so far) that the mk2 and 3 have the same prefix letters of GP, which is odd but BSA have done that with other Airsporters, mainly the carbine (and carbine S) and Stutzen have the same prefix letters as well.

So how do i find out if my airsporter s is a mk2 or 3 if they have the same prefix number. Mine is gp.