Here you go! Customers have been asking for years and we're finally just a couple of weeks from releasing our own machined aluminum trigger housing. We've posted here unedited footage of Production Manager Paul Eggleston test-firing the housing in a 9mm CX4 on our shop range. The release product will be black-anodized to match our Adjustable Aluminum Trigger. 15 of the first run of 20 have been sold. More information and pictures coming soon!

SierraPapa now has our 07 FFL

SierraPapa is now legally able to receive your CX4s and perform a variety of gunsmithing work, including our new Flat Top and Collapsible Buttstock mods. As always, we do NOT need your gun or even your lower to install our Hammer/Trigger/Spring Kit-- just send in your housing as per these instructions.


At SierraPapa we provide the aftermarket parts that make the Beretta Storm CX4 into the carbine it deserves to be. Since our aim is to "improve the breed" we only supply CX4 Storm parts and accessories of superior design and the highest manufacturing quality. We welcome suggestions from users for the improvement of our present products and any recommendations for new Beretta CX4 accessories that you may wish us to introduce.


Please read our Safety and Reliability announcement, and view this video that will guide you through the process of removing your trigger housing and shipping it to us. 

Please read our Warranty and Terms of Sale