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GLOCK® Parts

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    Glock® 21 Compatible Upper Parts Kit

    Glock® 21 Compatible Upper Parts Kit

    Building a custom G21 or PF45 slide? You need this slide parts kit. Ready to build a custom GLOCK® slide for your Gen 3 pistol or Polymer80 build? You need to pair it with a parts kit like this one. We've got your PF45 build (or factory GLOCK®...

    Was: $104.99
    Now: $89.99
  • Sale
    Glock® 21 Compatible RMR Cut Bull Nose Slide - .45acp 5 Glock® 21 Compatible RMR Cut Bull Nose Slide - .45acp 6 Glock® 21 Compatible RMR Cut Bull Nose Slide - .45acp Glock® 21 Compatible RMR Cut Bull Nose Slide - .45acp 2 Glock® 21 Compatible RMR Cut Bull Nose Slide - .45acp 3

    Glock® 21 Compatible RMR Cut Bull Nose Slide - .45 ACP

    Gen 3 compatible. RMR optic cut. Improved serrations and machining. This GLOCK® 21-compatible slide features a slick bullnose profile with improved, multi-directional front and rear serrations providing improved grip. This slide's also cut from 416R...

    Was: $179.99
    Now: $169.99
  • Complete RMR Slide Assembly for Glock® 21 2 Complete RMR Slide Assembly for Glock® 21 Complete RMR Slide Assembly for Glock® 21 4 Complete RMR Slide Assembly for Glock® 21 3 Complete RMR Slide Assembly for Glock® 21 5

    Complete RMR Slide Assembly for Glock® 21

    Complete your GLOCK® 21 compatible PF45 frame (or upgrade your Gen 3 pistol) with this red dot-ready slide assembly. Its cut with the popular RMR footprint, and features front and rear serrations with a simple but rugged matte black finish. It's also...

    $249.99
  • Glock® 21 Compatible Lower Parts Kit

    Glock® 21 Compatible Lower Parts Kit

    Ready to assemble your PF45 or G21 frame? Grab this kit. This Gen 3 GLOCK® compatible lower parts kit is specifically designed for G21 pistols and Polymer80 PF45 frames. It features OEM-spec components to ensure reliability and an easy installation...

    $74.99
  • Glock® Compatible HD Fiber Optic Sight Set 1 Glock® Compatible HD Fiber Optic Sight Set 2 Glock® Compatible HD Fiber Optic Sight Set 3 Glock® Compatible HD Fiber Optic Sight Set 4 Glock® Compatible HD Fiber Optic Sight Set 5

    Glock® Compatible HD Fiber Optic Sight Set

    Bright HD fiber optics for your GLOCK® slide. This HD Sight kit's front iron sight provides a crisp, bright red glow, even in low-light conditions. The rear sight features a simple but effective open leaf with subtle knurling to reduce even faint...

    $44.99
  • ROOK Tactical Rear Rail System (Polymer80 PF45)

    ROOK Tactical Rear Rail System (Polymer80 PF45)

    Machined from solid billet 17-4 stainless to improve your PF45's function. ROOK Tactical's PF45-Compatible, Precision Machined Rear Rail System is the ticket to ensuring your .45-cal P80 build enjoys a reliable slide that cycles smoothly. Pair the Rear...

    $42.99
  • GLOCK® 21 Compatible Stainless Steel Fluted Barrel 4 GLOCK® 21 Compatible Stainless Steel Fluted Barrel 5 GLOCK® 21 Compatible Stainless Steel Fluted Barrel 6 GLOCK® 21 Compatible Stainless Steel Fluted Barrel GLOCK® 21 Compatible Stainless Steel Fluted Barrel 2

    GLOCK® 21 Compatible Stainless Steel Fluted Barrel

    GLOCK® 21 and P80 compatible. Fluted for weight savings. Fully polished stainless. There's a lot of quality packed into this little G21-compatible barrel. It's been forged from high-quality 416R stainless steel, cut and fluted to reduce weight, then...

    $99.99
  • Glock® 21 Compatible RMR Cut Slide - .45acp 5 Glock® 21 Compatible RMR Cut Slide - .45acp 6 Glock® 21 Compatible RMR Cut Slide - .45acp Glock® 21 Compatible RMR Cut Slide - .45acp 2 Glock® 21 Compatible RMR Cut Slide - .45acp 3

    Glock® 21 Compatible RMR Cut Slide - .45 ACP

    Gen 3 compatible. RMR optic cut. Rear angled serrations. This GLOCK® 21-compatible slide features a pre-cut RMR optic footprint and angled rear serrations for improved grip. Cut from 416R stainless, heat-treated and coated in a matte black powdercoat...

    $169.99
  • Glock® 21 Compatible Barrel Glock® 21 Compatible Barrel Glock® 21 Compatible Barrel Glock® 21 Compatible Barrel

    Glock® 21 Compatible Barrel

    OEM performance and price. Sometimes, it's best to stick with factory-spec components -- like this DLC-coated, G21-compatible barrel -- to guarantee reliable cycling and good accuracy with any .45 ACP load. Barrel Compatibility This barrel fits all Gen 1...

    $79.99
  • GLOCK® 21 Compatible Stainless Steel Barrel 4 GLOCK® 21 Compatible Stainless Steel Barrel 5 GLOCK® 21 Compatible Stainless Steel Barrel 6 GLOCK® 21 Compatible Stainless Steel Barrel GLOCK® 21 Compatible Stainless Steel Barrel 2

    GLOCK® 21 Compatible Stainless Steel Barrel

    Factory Gen 3 and Polymer80 Compatible. Full stainless. This GLOCK® 21-compatible stainless barrel provides high accuracy and good looks at a great price. With a fully polished finish, this barrel's more resistant to corrosion and easier to clean,...

    $99.99
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 Quality GLOCK® Parts for factory and custom-built P80 pistols.

Like the popular AR-type rifle, the GLOCK® handgun is loved for its massive market of aftermarket and custom parts. At 80% Lowers, we're happy to provide a catalogue of American-made, custom GLOCK® barrels, slides, and individual slide and frame parts to complete or upgrade your favorite striker-fired handgun.

P80 Frames and Parts Available

Starting your first "from-scratch" build? Check out the P80 frames.  Need all the other parts to finish your pistol? You're still in the right place! We have lower and upper parts kits, barrels, slides and more! - for GLOCK's most popular handgun series, including the G17, G19, and G43.

Drop-in GLOCK® Barrels and Slides

You built or bought a GLOCK, and now you wanna make it better. Easy. Check out some of our match-grade barrels, like this target-crowned GLOCK 17 barrel. It's compatible with factory and P80 Gen 3 pistols.

Optic-Cut GLOCK® Slides

Few upgrades are better than a micro-red dot, but you need the right optic-cut slide. We've got you covered with quality slides made from 416 stainless, provided by LFA. Their Elite G17 Slide is pre-machined for an aftermarket reflex sight, like the popular Trijicon RMR. Coupled with weight-reducing vents and a tough Cerakote finish, an upgraded slide like the LFA Series is a perfect way to set your GLOCK® or P80 pistol apart from all the rest.


DISCLAIMER: “GLOCK” is a federally registered trademark of GLOCK, Inc. and is one of many trademarks owned by GLOCK, Inc. and GLOCK Ges.m.b.H. Neither 80% Lowers, a/k/a 80-lower.com nor this site are affiliated in any manner with, or otherwise endorsed by, GLOCK, Inc. or GLOCK Ges.m.b.H. The use of “GLOCK” on this page is merely to advertise the sale of GLOCK pistols, parts, or components. For additional genuine GLOCK, Inc. and GLOCK Ges.m.b.H products and parts visit www.glock.com.


DISCLAIMER: If you are new to the world of DIY gun building, you likely have a lot of questions and rightfully so. It’s an area that has a lot of questions that, without the correct answers, could have some serious implications. At 80-Lower.com, we are by no means providing this content on our website to serve as legal advice or legal counsel. We encourage each and every builder to perform their own research around their respective State laws as well as educating themselves on the Federal laws. When performing your own research, please be sure that you are getting your information from a reliable source.

We are a national retailer of individual components and not all products depicted on this website are legal in every state. Shipping of various products found on this website are prohibited to some states (such as California, Connecticut, District of Columbia, Hawaii, New Jersey, New York, Rhode Island, and Washington). The information, pictures, text or products presented on this website are not a representation by us, and should not be understood by you, that any product or completed firearm is legal to assemble or own in your state of residence. We encourage each and every builder to perform their own research about the state and federal laws that apply to them. It is your responsibility to understand the law and we encourage you to consult with an attorney or your local ATF representative.