Anyone using any of the new BCM.....?

[Wake27]

I have one but it’s a backup gun. Also had issues last time I went out, I need to do some testing to try and isolate the problem.


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[BufordTJustice]

I have one but it’s a backup gun. Also had issues last time I went out, I need to do some testing to try and isolate the problem.


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Are the mk2 uppers also a borderline-interference-fit for the barrel extension, like the std forged BCM uppers?


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[grizzman]

I’ve used a few BCM uppers paired with BCM barrels, including a MK2. None of them required heat for assembly.

[1168]

Are the mk2 uppers also a borderline-interference-fit for the barrel extension, like the std forged BCM uppers?


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Mine required heat, freezing, grease, foul language, and a 2x4.

[bugsy714]

Mine required heat, freezing, grease, foul language, and a 2x4.

Sounds like a fun time at Bubba’s basement to me

I used a micro torch to heat the extension and then while it was still hot give it a few good wax with a rubber mallet on the end of the receiver to seed it


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[titsonritz]

Sounds like a fun time at Bubba’s basement to me

I used a micro torch to heat the extension and then while it was still hot give it a few good wax with a rubber mallet on the end of the receiver to seed it


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Bring out the gimp.

[Wake27]

Are the mk2 uppers also a borderline-interference-fit for the barrel extension, like the std forged BCM uppers?


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I thought all BCM uppers were but this is a factory upper so couldn’t tell you.


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[markm]

Sounds like a fun time at Bubba’s basement to me

I used a micro torch to heat the extension and then while it was still hot give it a few good wax with a rubber mallet on the end of the receiver to seed it

Heating the extension would make it expand and increase the difficulty of assembly no?

[1168]

Heating the extension would make it expand and increase the difficulty of assembly no?

When rings expand with heat, the inside diameter increases.

[markm]

When rings expand with heat, the inside diameter increases.

So it wouldn't help with the outer diameter that's tight fitting in the receiver right? I'm thinking you'd want either the receiver to expand or the Extension to contract. Thus, head on the upper receiver would be the trick.