SIG's states that P220's with a "green colored" recoil spring are rated for
+P ammunition. I'm not exactly sure in what year this change took place;
but I have a '95 model .45 caliber P220A, and it has the green colored
spring.
BTW, it won't appear really green, as its more like a cascade bluish green.
I think it was around 94 or 95 that Sig redesigned the frame slightly to help with any issues caused by P+ ammo. This was at serial number 219166. Also at the same time they started using a new trigger group as the old design was not capable of being converted to DAO.
Keep in mind that although Sig says P+ is alright in the 220 it will accelerate wear just as any other pistol. I wouldn't shoot a bunch of them.
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