09-13-2021, 02:14 PM
The fit between the barrel and upper receiver needs to be snug or tight. BCM upper receivers usually need the barrel frozen and the upper warm to get the barrel seated for a thermal fit. Using shimming material or Loctite can be used where the fit is not optimal. I have a Friend who will lap the face of the receiver to ensure it is square. With a quality barrel, good ammo and a properly installed barrel normally provide good results.
There have been forum members who have seen improved accuracy after ensuring the barrel was bedded and the barrel nut torqued properly. Every barrel is unique but generally quality barrels produce good accuracy with a wider variety of ammo. The proper, barrel chamber, gas port size, gas block, gas tube alignment, buffer and spring account for the reliability in cycling.
There have been forum members who have seen improved accuracy after ensuring the barrel was bedded and the barrel nut torqued properly. Every barrel is unique but generally quality barrels produce good accuracy with a wider variety of ammo. The proper, barrel chamber, gas port size, gas block, gas tube alignment, buffer and spring account for the reliability in cycling.