So Who Makes The Best Upper and Lower Receivers

[FrankieJames7]

such as which company makes their receivers with exact and true tolerances and who makes them to where the barrel extension hole is slightly undersized to get a genuine cooled or heated press fit? i imagine the barrel extension can also be oversized to accomplish the same thing

[mineralman55]

If it is any help, I had to use a paint stripping gun to heat my Aero Precision M5 upper to get the Ballistic Advantage (Aero's own brand) barrel to slide in. Very tight fit.

[survivalshop]

On April 29, 2016 at 3:06 PM, FrankieJames7 said:

such as which company makes their receivers with exact and true tolerances and who makes them to where the barrel extension hole is slightly undersized to get a genuine cooled or heated press fit? i imagine the barrel extension can also be oversized to accomplish the same thing

  How tight do you need the fitment of the Barrels Extension in the Upper Receiver ? It is tightened down with a Torqued Barrel Nut . I've never had one that was a loose fitment

  There are no std. spec's ( exact &  true tolerances )  in regards to the 308AR platform.  Tight fitment in some may only be the Finish applied to the Upper Receive .

[bdavison78613]

mineralman55 how do you like the ballistic advantage barrel? what kind of accuracy is it giving you and what length did you get?

[mineralman55]

So far so good. It's a 16" inside an Aeroprecision M-lok upper. Fit and finish was perfect. It's still breaking in, but I'd say it's easily under 2MOA with iron sights. Doesn't seem to lose accuracy with extended time and firing at the range. I'd buy another.