StoneHendge Wrote:Montana, I agree with you that McGowen shouldn't be considered a reputable manufacturer, but the fact I couldn't remove one of their barrels from a BCM receiver with a blowtorch and a mallet was the least of my worries given the other issues it had. Whether the issue with my inability to remove it was the receiver or the barrel extension (or a combination of both), only the dumpster and Eagle County landfill know.

But the potential pitfalls I otherwise see in the concept aren't related to the barrel extensions OD. A rack barrel extension goes for $20-25. When JP sold AR-15 barrel extensions ala carte, they were $60. There's a reason for that, and it's all about the exacting precision with which it mates with their receivers - in terms of alignment, not just dimension. In addition to only using a JP barrel extension, John Paul would also recommend only using a JP handguard since they also control the precision with which the barrel nut mates with the receiver extension, it's threads, and the flange on the barrel extension.

As to my comment about them being a cult, I was referring to the non-religous meaning. I think you (along with the few posters who have stated that they are the only uppers they'll use) have validated that. Along with my comment that one man's out of spec receiver is another man's gold. It is just an out of spec receiver to me .

StoneHendge Wrote:Montana, I agree with you that McGowen shouldn't be considered a reputable manufacturer, but the fact I couldn't remove one of their barrels from a BCM receiver with a blowtorch and a mallet was the least of my worries given the other issues it had. Whether the issue with my inability to remove it was the receiver or the barrel extension (or a combination of both), only the dumpster and Eagle County landfill know.

But the potential pitfalls I otherwise see in the concept aren't related to the barrel extensions OD. A rack barrel extension goes for $20-25. When JP sold AR-15 barrel extensions ala carte, they were $60. There's a reason for that, and it's all about the exacting precision with which it mates with their receivers - in terms of alignment, not just dimension. In addition to only using a JP barrel extension, John Paul would also recommend only using a JP handguard since they also control the precision with which the barrel nut mates with the receiver extension, it's threads, and the flange on the barrel extension.

As to my comment about them being a cult, I was referring to the non-religous meaning. I think you (along with the few posters who have stated that they are the only uppers they'll use) have validated that. Along with my comment that one man's out of spec receiver is another man's gold. It is just an out of spec receiver to me .

StoneHendge Wrote:It is just an out of spec receiver to me .

lazyengineer Wrote:Eh, to each their own. I run "out of spec" twist rates and "out of spec" barrel profiles too.

keystone183 Wrote:Somebody remind me of what 'mil spec' acceptable MOA is........:eek:

DCC83501 Wrote:Someone is full of themselves I see. Always interesting to see how some people enjoy the thought of looking down on others, and their experiences..........................................

StoneHendge Wrote:Montana, I think we can agree to disagree! (btw, the shipped cost of that removal rod ($59 to me) is about what I paid for the BCM receiver ( I think it was $69)).

montana Wrote:I'm sure an old barrel nut and 1" wood dowel could have worked just as well or better than beating on it with a mallet...Just saying.....

StoneHendge Wrote:I beat on a 1" wood dowel with the mallet. After heating the receiver extension with a blow torch.

Red*Lion Wrote:In case anyone is interested.
https://bravocompanyusa.com/bcm-upper-receiver-m4-flat-top-m4-feedramps-complete-unassembled-demo-scratched/

StoneHendge Wrote:Montana, I think we can agree to disagree! (btw, the shipped cost of that removal rod ($59 to me) is about what I paid for the BCM receiver ( I think it was $69)).



Please refrain from making personal attacks - it's a violation of Forum rules. I'm interested in hearing about how I'm looking down on anyone, though.

DCC83501 Wrote:Some people happen to believe that the tight fit created by utilization of the intentionally smaller diameter BCM upper gives them better odds at having an accurate rifle. You clearly made the comment equating people that hold such belief as cultish.

I do not attack people, but I did make an observation. I’ll continue to utilize BCM uppers, or shim with SS, if not available. I will also continue to make certain, in my mind, that the face of any upper receiver is squared. I’ll not suggest to anyone else that doesn’t follow my reasoning that they are wrong or ignorant.

StoneHendge Wrote:BCM receivers appear to be an object of great veneration with a body of admirers.

[ATTACH=CONFIG]18023[/ATTACH]

Could you please point out where I suggested that anyone who uses them is wrong or ignorant?

DCC83501 Wrote:Some people happen to believe that the tight fit created by utilization of the intentionally smaller diameter BCM upper gives them better odds at having an accurate rifle. You clearly made the comment equating people that hold such belief as cultish.

biodsl Wrote:I'm a fan. I like the barrel thermo-fit feature.