Seekins Precision 0010330021 Replacement Magazine 3rd 6.5 PRC Fits Havak PH1/PH2 Black Carbon Fiber $90.00
Warne MEG422BLK Magazine Extension made of 6061-T6 Aluminum with Hardcoat Anodized Black Finish for Glock 42 Magazines (Adds 2rds) $34.99
Warne MEG1932DE Magazine Extension made of 6061-T6 Aluminum with Hardcoat Anodized Flat Dark Earth Finish for Glock 19, 23 Magazines (Adds 3rds 9mm Luger, 2rds 40 S&W) $39.99
Strike Industries EMPCLIPR Magazine Pocket Clip Stainless Steel Black for SI EMP Mag Extension Right Hand $6.95