This is a factory SIG Sauer R522 or P522 .22 LR magazine and it is designed to work with similar Atchisson-type .22 LR conversion systems. It features a 25 Round capacity, Clear Grey Polymer Construction, with six screws for complete disassembly. It is the same size as a curved USGI style 30 round magazine as a result feeds very reliably.

Specifications and Features:
25 Round Capacity magazine
.22 Long Rifle
Atchisson-type Conversion Systems
Clear Grey Polymer Finish

Fits:
ATI Kits
Chiappa Kits
CMMG Kits
Ceiner Kits
Spike's Tactical Kits
Stag Arms Kits
SIG R522 & P522
Target Sports Kits
Tactical Industries Kits
Tactical Solution Kits