80% ARMS GST-9 MOD1 80% LOWER RECEIVER BLACK G19 G19X G19L G17 GLOCK 19 P80 POLYMER80 - 38019-BLK from MAS Defense near Charlotte, NC

Released in November 2019, the original GST-9 took the 80% world by storm, offering modular enhancements to a Glock style frame without losing any parts compatibility. Two years and hundreds of thousands of rounds downrange later, we've raised the bar again with the GST-9 MOD1.

What makes the GST-9 MOD1 version so special?

• Modular frame gives you the possibility of a 19, 19X, 19L, & 17 size weapon system in a single 4-in-1 platform.

• Grip Extension The Compact 19 Grip Extension is included. The option to purchase a Full Size 17 Grip Extension is above in the drop down box.

• Compatible with Glock 19 3rd generation parts, holsters, & aftermarket accessories. GST-9 is the first and only 80% lower that is compatible with Glock holsters

• Ergonomic features include an undercut trigger guard, high beavertail, glove bevel, scalloped mag release, no finger grooves, & newly redesigned gas pedals as standard

• Premium internal rail components extended 3X, made of stainless steel, with multiple coating options

• Easily ships to your door & completes in minutes

• Slides The MOD1 does NOT accept Glock 17 slides. The MOD1 frame accepts Glock 19, Glock 19L, & Glock 19XL slide

With two years of feedback from our customers, we made a few changes to our GST-9 frame to stay ahead of the competition. First, we relocated the gas pedals forward, and re-contoured them to further optimize control over the frame through the recoil cycle, helping to drive the gun back to target faster and more efficiently. We also re-contoured our modular grip attachment surfaces so that every grip option gives you a perfect fit, for the cleanest build possible. Internally, we separated the rear-rail module to improve the builder's experience, with users now only needing to line up one hole at a time, further simplifying the build process.

The GST-9 MOD1 is built from the ground up to be reliable, customizable, and accurate. It's the most functional and user-customizable 80% Glock compatible frame on the market. And, like all of our products, it is backed by our Lifetime Warranty and our premium customer support. Every MOD1 Frame comes with a Compact Grip Module in the selected frames color.