About Builder’s Pistol Supply
Builder’s Pistol Supply was founded by Derek Holt in Phoenix, Arizona. Derek is a lifelong DIY enthusiast who built his first Polymer80 pistol in 2016 — back when the platform was new and information was scarce. Over the next eight years, he completed over 40 P80 builds across every frame model Polymer80 has released, learning the hard way which parts work together and which combinations cause problems.
That hands-on experience is what sets Builder’s Pistol Supply apart. Derek started the company in 2024 because he was frustrated with the existing options for P80 parts. Big retailers sell everything from AR parts to optics to holsters — firearms parts are just one category among hundreds. They can’t tell you whether a specific slide will cycle reliably with a particular recoil spring weight, or whether a certain barrel brand tends to have tight chamber specs that cause feeding issues with certain ammo.
Builder-to-Builder Knowledge
We focus exclusively on the Polymer80 platform. Every product in our store has been personally evaluated by Derek and our build team. When we recommend a lower parts kit, it’s because we’ve installed it in multiple frames and put hundreds of rounds through the resulting pistol. When we pair components in our complete build kits, it’s because we’ve verified those exact combinations work together reliably.
Our Promise
We believe building your own pistol should be accessible, enjoyable, and result in a firearm you’re proud of. That means quality parts, honest descriptions, real build guides, and support from people who have actually done what you’re about to do. If you get stuck on a build step at 10 PM on a Saturday, email us — we’ll get back to you because we’ve been there and we know how it feels.