DD17.2 Rail & Locking Block Kit

DD17.2 Rail & Locking Block Kit Overview

The DD17.2 Rail and Locking Block Kit delivers the essential metal components needed to complete your FMDA DD17.2 3D printed Glock 17 frame. This bundle includes precision-formed front and rear rails plus a 17-4 stainless steel locking block—everything required to transform your printed frame into a functional full-size 9mm pistol.

The FMDA DD17.2 is widely considered the most versatile and strongest 3D printed Glock 17 frame design available. Its trouble-free assembly process and improved no-screw rear rail system make it the go-to choice for builders seeking reliability without extensive hand-fitting. This kit is manufactured in the USA from high-quality stainless steel and machined to tight tolerances for perfect fit every time.

What Makes This DD17.2 Kit Different

Precision-Formed Rails
The front rails in this kit are the same high-quality, high-tolerance rails offered in the original FMDA G17 rail kit—proven components trusted by builders worldwide. The rear rails feature an all-new design specific to the DDxx.2 frame series, engineered to work with the improved no-screw mounting system that makes the DD17.2 stronger and easier to assemble than earlier generations.

Frame-Supported Rear Rail Design
The DD17.2’s rear rails are supported by both the frame and the trigger components, creating a dual-support system that’s more rigid than the screw-in rails of previous FMDA designs. To protect these precision-formed rails during shipping, we include a protective holder that maintains proper dimensions until you’re ready to install.

Matched Locking Block
The included Gen 3 full-size locking block is machined from 17-4 stainless steel for exceptional strength and corrosion resistance. This is a direct replacement for Glock Part #1447 and fits all three-pin Gen 3 Glock 17 pattern builds including the DD17.2 and its various remixes.

American Manufacturing
Every component in this kit is 100% made here in the US. The rails are precision-formed from high-quality stainless steel, and the locking block is CNC machined to exact specifications. No overseas sourcing, no quality compromises.

What You Need to Complete Your DD17.2 Build

To finish your 3D printed Glock 17, you’ll need this rail and locking block kit plus a Gen 3 Glock 17 lower parts kit and a compatible Gen 3 Glock 17 slide assembly. The DD17.2 is also compatible with Glock 22 (.40 S&W) uppers if you prefer that caliber. Frame files are available via DEFCAD. Print settings and assembly instructions are included with the file package.

Components