Then swiss arms are bad people for lying (to the RCMP AND us) to get the rifle in if in fact it IS based on the 550. But from every thing I have read it's designed as a semi-only rifle built with the lower designed off the S.A. 540 lower receiver, and thusly is more designed off of the 540 than the 550, but now try to convince the RCMP ofthat when all they do are look at a gun to determine it as a variant of something...
I have looked at the detailed (exploded) diagrams of both the 540 and the 550. I also compared those with the diagram included in the manual for an early SAN and, for the life of me, I can't tell the difference between the 540 and the 550. At least, the uppers that are the "legal" receivers, look identical to me. Now, if the dimensions of, say, the bolt carriers are different and not interchangeable, I cannot tell. So there may be some dimensional differences otherwise the actions are the same. To complicate matters even more, the manual of the early SAN that I have seen from a friend out in BC lists the rifle that it describes as 550 and 551 (the carbine version). Now, I am not saying that the SAN is not based on the Sig 540, since the 550 is also a variant of the 540, but how does one tell them apart? Is the lower that makes the difference in some way but the lower is not the "firearm" in Canada. I hope someone can make sense of this and the SAN owners can keep enjoying their unrestricted rifles.


















































