An optic-ready G21 build kit w/ upgraded barrel and pre-assembled slide.
This Glock® 21-compatible build kit comes quality, OEM-grade internal components, with a quality, precision-cut barrel accompanying the pre-assembled optic-ready slide.
This kit's G21 slide features a durable black nitride finish that maintains machined tolerances for a perfect fit with no break-in, while its RMR footprint that provides compatibility for the most popular pistol red dots.
Glock® 21 Build Kit: What's Included
This kit is not a firearm. This Glock®-compatible kit includes a slide, barrel, operating rod with spring, slide parts kit, and frame parts kit. This kit does not include a frame.
Slide
- Platform: G21
- Caliber: .45 ACP
- Material: 416R Stainless
- Finish: Black QPQ Nitride
- Features: Preassembled; Front & rear angled serrations; RMR cut; Compatible w/ factory iron sights
Barrel
- Caliber: .45 ACP
- Twist Rate: 1:16
- Material: 416R Stainless
- Finish: Nitride Black or Bare Stainless
Slide Parts Kit Includes:
- Firing pin
- Firing pin spring
- Firing pin spring cup
- Firing pin safety
- Firing pin safety spring
- 9mm Extractor
- Extractor depressor plunger
- Extractor depressor plunger spring
- Channel liner
- Spacer Sleeve
- Steel cover plate
- Polymer guide rod (guide rod, washer, screw)
- Guide rod spring
Frame Parts Kit Includes:
- Connector
- Slide Stop Release with Spring
- Locking Block Pin
- Magazine Release
- Magazine Release Spring
- Slide Lock
- Slide Lock Spring
- Trigger Housing Pin
- Trigger Housing with Ejector
- Trigger Pin
- Trigger Spring
- Trigger with Trigger Bar
Sold Separately:
- Striped Frame
- Pistol red dot
- Magazine
- Iron Sights
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 Gun Builders Depot, a/k/a gunbuilders.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.
WARNING: Handling firearms parts and accessories can expose you to lead and other petroleum products known to the State of California to cause cancer and reproductive harm. For more information go to: www.P65Warnings.ca.gov
Shipping of various parts and/or accessories are prohibited to states and locales (ie New Jersey, California, New York, etc…) with restrictions against certain parts and/or accessories or "assault weapons" (i.e. states with high-capacity magazine restrictions, manufacturing of semi-automatic weapons, etc..). It is your responsibility to be aware of your local firearms laws before purchasing from our website or machining a firearm. We try our best to keep our shipping page current, but laws change daily.
GunBuilders.com only ships within the United States. Federal legislation dictates we cannot ship our products internationally.
