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The S15 magazine is a revolutionary magazine that holds 15 rounds instead of the standard 10 rounds in the Glock® 43X and Glock® 48 models. While being the same length as the OEM Glock® 10 round magazine, it provides a 50% increase in capacity due to Shield Arms' patent-pending magazine geometry. This unique design allows the magazine to stagger the rounds, fitting more of them in the same space. The S15 maintains the same Glock® reliability that the company is known for, making it a great option for those who want more rounds in their magazine without sacrificing dependability.

In the gen 2 magazine, Shield Arms made several enhancements including an ambidextrous mag catch cutout on both sides, smaller mag catch cutout windows, improved magazine tube geometry and baseplate geometry. Additionally, Shield Arms now offers the S15 with a Powercron finish, which is a cationic epoxy coating that provides excellent corrosion resistance and low VOC in a lead-free film electrocoat surface finish, making it perfect for those in humid or saltwater environments or who sweat a lot.

The S15 boasts of a 15 round capacity and is the same length as the OEM Glock® 43X/48 magazine. It has an easy to remove, impact-resistant base pad, high lubricity finish, black oxide coating and is made in the USA. However, Shield Arms recommends swapping out the plastic OEM mag catch with either their standard or premium steel mag catch to avoid any potential reliability issues. If using another manufacturer's mag catch, the reliability may be compromised. Additionally, Shield Arms recommends upgrading to one of their steel mag catch offerings if using a first-generation aluminum mag catch.