The Rival Arms Slide Completion Kit for the Glock 21 (brand part no. RA-RA42G006A) puts every internal part a build needs to finish a slide in one box, machined to tighter tolerances than factory Glock parts. Select components are CNC-machined from solid stainless steel billet and finished with a low-temperature vacuum PVD coating that creates a durable barrier against wear, and every part is individually hand inspected for accuracy before it ships. Instead of sourcing a striker, extractor, and a half-dozen small springs individually, a builder gets everything needed to complete the slide’s internal workings in one kit, no gunsmith required, then just adds a barrel, guide rod, and finished lower for the range.

Key Specifications

• Fits the Glock 21 slide.
• Machined to tighter tolerances than factory Glock parts.
• Select parts CNC-machined from solid stainless steel billet.
• Finished with a low-temperature vacuum PVD coating for wear resistance.
• Every part is individually hand inspected for accuracy.
• Includes the striker (firing pin), striker safety, and related springs.
• Includes the extractor, back cover plate, slide channel liner, and spring-loaded bearing.
• Installs with no gunsmith required.
• Backed by a limited lifetime warranty.

Frequently Asked Questions

What’s included in this kit? Every internal part needed to finish the slide: striker, extractor, striker safety, back cover plate, channel liner, springs, and related small parts.

Is a gunsmith required to install it? No, the kit is designed as a drop-in build with no gunsmithing required.

Is this covered by a warranty? Yes, Rival Arms backs it with a limited lifetime warranty.

Buy the Rival Arms Slide Completion Kit for Glock 21

Finish your Glock 21 build with precision, hand-inspected parts. Order the Rival Arms completion kit from our Glock parts lineup at our Lubbock, Texas gun shop for fast, direct shipping.