The CMMG 22ARC Firing Pin Spring is a precision-engineered replacement component designed specifically for 22ARC firearms.CMMG 22ARC Firing Pin SpringPart Number: 22BA4A4UPC: 810046235799Designed specifically for 22ARC caliber firearmsOEM quality replacement componentEssential for proper firing pin function and reliable operation of your 22ARC firearm. Manufactured by CMMG to exact specifications for optimal performance and durability.