These releases are made from a high strength alloy and hard coated and match the factory profile per rule 21.6 in the USPSA rulebook. These are a great addition to competition pistols or for those who want a little extra reach so you don't have to shift your grip to drop a magazine. This is extended .1" longer than the factory release and is suitable for carry and competition use. *USPSA Production, Limited, and Open approved approved.* 4.53 Grams 0.154 OZ