Possible size incompatibility - TacFire UP01C AR-15 Stripped Upper Receiver Black Hardcoat Anodized

So I have a buddy’s rifling mine that I’m rebuilding with a new upper but as a precaution make sure to check if the upper, lower and the bcg and ch handle doesn’t seem to bind within the buffer as I believe that’s my issue because at the moment my charging handle is messed up at the portion in which it pulls the bcg from having to excessively pull In order to charge with a worse case of it not feeding upon release 75% of the time and bindin