Yes there are 10 shot mags for uscspecial needs persons.

SIG Sauer P322 Specifications

Type: Hammer fired, blowback operated, semiautomatic
Cartridge: .22 LR
Capacity: 10+1 rds. (optional); 20+1 rds., 25+1 rds. (included)
Barrel: 4 in.
Overall Length: 7 in.
Width: 1.4 in.
Height: 5.5 in.
Weight: 1 lb., 1.1 oz.
Finish: Anodized aluminum (slide); stainless steel (internal frame)
Sights: Fiber optic, green (front); adjustable, fiber optic, green, notch (rear)
Trigger: 4 lbs., 8 oz. (SAO)
MSRP: $479
Manufacturer: SIG Sauer, 603-610-3000, sigsauer.com

I see the open rear sight can probably be used through the optical sight. ?