When Sig phased out the P228 from the civilian market, they were still producing the P228 M11 variant for US DOD for a number of years after. The P229 9mm had taken over the role for the civilian market at that point.
Sig produced the SP series for the first set of military trials. It was meant as a lightweight, polymer pistol with interchangeable backstraps for different hand sizes.
Based on Sig's history, I predict that they will phase the SP series out of the civilian market, but continue to produce for their contracts. The P320 has already replaced the SP for its military trial contender and won so focus will be routed to P320 production (and "voluntary upgrade").
Sig could care less about CA and I doubt the would bother to keep it here. So many Sigs have already fallen off-roster that are still available elsewhere.

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