To be honest I have not heard of any issues like that with the BCA right hand side charging uppers. But it could be a possibility.
I know there can be issues with compatibility on certain ambi uppers and side charging bolt carrier mixing.
There have been issues with handle shafts being too short when using BCA side charging bolt carriers with different side charging uppers like Eisenach, CMT and Young, if I remember correctly.
These uppers have thicker sidewalls. They need a handle with a longer shank.
BCA handle; top. Davidson Defense; center. ADK; bottom. You can see how much longer the shaft is on the ADK compared to the other two.
One of my 6.8 SPC right hand side charging AR's is a mix of a BCA upper matched with an old new stock LAR NIB bolt carrier.
Of course the obligatory picture. :a26:
Thanks,
Glenn