Cross Mags are designed for AR15 pistols, and nothing else. That said, the issue with the various Canadian made “18” based rifles in regards to magazine related performance is that they are all copying the same flawed bolt carrier dimensions and/or bolt carrier centerline, as it pertains to the bolt carrier centerline referenced to the lower receiver. This is why the bolt hits the feedlips on some magazines. The consistency of some of these rifles leaves a lot to be desired. You can have two of the same rifle side by side, one will consistently hit the feedlips, or at least drag on the feedlips of virtually every magazine available, and the next rifle won’t hit or drag on any of them.
There are a few ways for the manufacturers to fix this issue. IF, the manufacturer is ok with the magazine sitting a bit lower in the assembly, they can simply shift the mag catch down. If they prefer to keep the magazine in its current position, then they must shift the bolt centerline UP, or, add clearance to the two surfaces on the bolt that run parallel to the magazine feedlips.
For end users wanting to make their rifles perform better with all mags, they can file about .005” or so off the TOP of their mag catch. Or, they can file about the same off the top of any offending magazines. More advanced users may elect to machine the surfaces on the bolt carrier for more clearance.
Hopefully these changes get implemented by the Canadian 18 manufacturers so that they are more compatible and reliable with all magazine types!
