I wonder how much effect our use of glue, and/or oversized extensions/tighter receivers has on the whole thing?
Jake?
Some are nearly an interference fit, and the ones that are not almost universally get glued.
Yes it is critical to have proper fitment with the barrel Extension and Receiver. If you don't want to spend the extra $60 for a oversized barrel extension, then use High Temp Red Loctite. If we are talking about a Precision Rig then don't Half Ass it! Polishe the Barrel extension to a mirror finish, true your Receiver Face (by a Professional) and Bed or Thermal Fit the Barrel, make sure to season the receiver theads and apply some Anti Seize, and lastly don't over torque the barrel nut, 50-65 FTLBs is ideal.