Our 22 Conversions are designed to work with any Mil-Spec upper receiver chambered in .223/5.56. Please note that while many AR platforms may appear to be Mil-Spec, their chambers are not, and our conversion kit will not work with them.
Our conversions will not work in any other chamberings such as 300BLK.
If you are sure that your rifle is chambered in .223/5.56 and still having problems installing it, please make sure that you have removed the rubber chamber adapter protector used to protect it during shipping.
Virtual Patent Information can be found here.