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Some of you are aware we are based in Tumwater, Washington. A state which recently passed the Unconstitutional Bill 5078 which bans the sale and possession of “High Capacity Magazines”

This Bill also effects our ability to manufacture one of our top selling accessories, the Velocity Mag Extension.

As of July 1st:

Killer Innovations will no longer be able to build or sell the Velocity Magazine Extensions.

We recommend at this time to stock up on the velocity extensions in the unfortunate event we are unable to find a way to continue to offer this product. We are deploying all of our resources to find a way to continue to provide our customers with this product.


Our new Velocity Mag Extensions “Enhanced Grip Feature” cuts will change the way you reload. E.G.F. cuts provide an aggressive serrated lip that give the shooter ultimate grip and angularity control while feeding the mag into the pistol. E.G.F. cuts are located at the bottom-front and sides of the mag extension, so however you prefer to grab your mag for a reload, a perfect grip is always there. The Velocity Mag Extension was designed with strength and durability in mind. Our testing proved the mag extension could survive massive abuse, being repeatedly dropped from 6’ onto concrete without a single failure. Cleaning your mag is made easy with our toolless floor plate removal. Just depress the retaining pin and slide the floorplate out. It’s that easy!

Mag Extension for Sig P320 Specs:

  • Material: 6061 T6 Aluminum
  • Finish: Anodize
  • Dims: 1.84″ x 1.20″ x 1.514″
  • Weight: 1.472
  • Compatible with: All P320 X Series Grip Modules, without OEM Magwell*
  • +5 rounds


Mag Extenson for Sig P320 Installation Instructions

*Due to some rolling changes in designs made by Sig, there is a chance that our parts may not be compatible with your specific gun, despite being noted as compatible with the variation.  Please test fit parts CAREFULLY to avoid damage, in case of incompatibility.  We will return or exchange undamaged parts.

Due to differences in metal composition and finishing processes, Killer Innovations cannot guarantee exact color matches among our accessory items.  For more information please see our detailed explanation.