Herrington Arms HA Magazine Extension Sig P320 +5 Rounds Black 5MAGEXT320-BL/BL-5RD. It works perfectly with 1517 and 21 round magazines This mag extension on a 17rd mag fits in the 141.25mm USPSA gauge This highly durable mag extension is made of...
Herrington Arms HA Magazine Extension Sig P320 +5 Rounds Black 5MAGEXT320-BL/BL-5RD. It works perfectly with 1517 and 21 round magazines This mag extension on a 17rd mag fits in the 141.25mm USPSA gauge This highly durable mag extension is made of...