Commercial Buff Tube/lower proprietary ?

[M4Fundi]

I have always had AR's with mil receiver extensions, but a family member has a Shrubmaster with a commercial tube on it. Can I just switch it out with a mil spec tube or is the lower's threads commercial proprietary only?

[wahoo95]

Threads are the same so the switch is easy.

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[M4Fundi]

That is what I thought, but wanted to make sure before performing surgery :D

Thanks!