accuracy difference on reciever\handguard interface

[Drifter]

The best way for me to determine a barrel's accuracy potential is to put it in a Mega monolithic upper (old style). If the results suit me, I might move the barrel to a different upper and handguard. If it doesn't shoot as well, I disassemble and reassemble with tweaks as necessary (re-true the receiver face, adjust barrel nut torque, etc) until its performance matches the monolithic. Sometimes, it takes a few tries. Once in a great while, I can't get a particular combination to work to my satisfaction.

Basically, I think a true monolithic is more forgiving when it comes to assembling an accurate setup. And coincidentally, I think Mega is supposed to start producing a monolithic again.