The CCW-MEDB9 magazine extension fits the DIAMONDBACK DB9 9mm Auto pistol, enhancing capacity by +1, as well as lengthening the gripping surface by over 3/8″ in length. Extension comes with a heavier spring for tuning on buyer's end (users seem to have success cutting two coils/links off before installing it in the DB9 magazine). This product is manufactured from 6061 aircraft aluminum, hard anodized black, and machine engraved (no longer the lasered white appearance).