mil spec lower

[Medina556]

Can having a commercial buffer tube on a mil spec lower cause malfunctions?

[The Cat]

Not really - mil-spec vs commercial relates to the outside diameter of the tubes. Milspec is slightly smaller than commercial.

[Medina556]

That's what I mean though I have a commercial buffer tube on a milspec lower

[Toyoland66]

Doesnt matter, the outside diameter is the only thing that is different, you have to use a different stock because of this.

The inside diameter is the same, uses the same spring and buffer.

Won't cause malfunctions, although a lot of commercial end plates are not properly staked, which can cause the tube to become loose.