Barrel & Caliber Conversion Kits
Conversion Kit Builders
Congratulations on buying the coolest firearm on the planet!!! Now you want an extra barrel or want to convert it to another caliber.
To buy the correct barrel and caliber conversion kit parts that will work with your XCR, you need to know just three things about your firearm: the length of the upper receiver; the type of gas block, and the position of that gas block on your barrel (also referred to as the length of the gas system).
To help you determine what you currently have, we’ve included 10 pictures of XCR-L rifles. Click “Configure” below the image that most closely matches your XCR-L’s current configuration. It will take you to another page which will help you choose what you need. (Note: In making the comparison, you can disregard the type of upper receiver (Keymod, M-LOK, or Picatinny); barrel length, stock type, etc.)
We highly recommend that you watch the video tutorial before using the builders.
XCR-L Conversion Kits
XCR-L Standard Length Upper Receiver (Approx. 17″ Long) with Type 1 Gas Block and Standard Length Gas System
XCR-L Standard Length Upper Receiver (Approx. 17″ Long) with Type 3 Gas Block and Standard Length Gas System
XCR-L Standard Length Upper (Approx. 17″ Long) Receiver with Type 3 Gas Block and Blackout Length Gas System
XCR-L Competition Length Upper Receiver (Approx. 23″ Long) with Type 3 Gas Block and Standard Length Gas System
XCR-L Competition Length Upper Receiver (Approx. 23″ Long) with Type 3 Gas Block and Blackout Length Gas System
XCR-L Mini Length Upper Receiver (Approx. 15.25″ Long) with Type 1 Gas Block and Mini Length Gas System
XCR-L Mini Length Upper Receiver (Approx. 15.25″ Long) with Type 3 Gas Block and Micro Length Gas System
XCR-L Mini Length Upper Receiver (Approx. 15.25″ Long) with Type 3 Gas Block and Mini Length Gas System
Micro Length Upper Receiver (Approx. 13.25″ Long) with Type 1 Gas Block and Micro Length Gas System
XCR-L Micro Length Upper Receiver (Approx. 13.25″ Long) with Type 3 Gas Block and Micro Length Gas System
XCR-L Mid Length Upper Receiver (Approx. 20″ Long) with Type 3 Gas Block and Standard Length Gas System
XCR-M Conversion Kits
XCR-M Barrel & Conversion Kit Builder for Standard Length Upper with Type 2 Gas Block and Standard Length Gas System
XCR-M Standard Length Upper Receiver (Approx. 20″ Long) with Type 3 Gas Block and Standard Length Gas System
XCR-M Competition Length Upper Receiver (Approx. 23″ Long) with Type 3 Gas Block and Standard Length Gas System
XCR-M Mini Length Upper Receiver (Approx. 18.75″ Long) with Type 2 Gas Block and Mini Length Gas System
XCR-M Mini Length Upper Receiver (Approx. 18.75″ Long) with Type 3 Gas Block and Standard Mini Gas System
XCR-M Mini Length Upper Receiver (Approx. 18.75″ Long) with Type 3 Gas Block and Micro Length Gas System
XCR-M Micro Length Upper Receiver (Approx. 15.75″ Long) with Type 2 Gas Block and Micro Length Gas System
