Noob AR buffer tube question

[texas_law_dog]

My understanding is that the threading on a buffer tube is the same between mil-spec and commercial (otherwise there would be 2 different types of lower receveivers). Is this correct? If so, has anyone ever had trouble installing a buffer tube and had to remove anodizing to get the tube installed?

[Xtracrispy]

The threads are the same(or at least should be). I personally have never had a problem(4 or so buffer tubes, in different lowers) but I won't say that it is not possible to need to do that.

What brands are the lower and buffer tube?

[Yerman]

Yes, the threads are the same. The differences are in the tube dimensions.

Are you having problems getting a buffer tube on? Did you closely inspect the threads for damage?

[texas_law_dog]

The lower was from an 80% and I believe there was a mistake in the anodizing process that added enough thickness to prevent threading. Had a similar problem with the take-down pin holes and the shop reamed them.

[Drew Eckhardt]

The lower was from an 80% and I believe there was a mistake in the anodizing process that added enough thickness to prevent threading. Had a similar problem with the take-down pin holes and the shop reamed them.

Note that the M16 blueprint requires the buffer and pistol grip holes to be threaded after anodizing.

[kcstott]

Note that the M16 blueprint requires the buffer and pistol grip holes to be threaded after anodizing.

Correct and it's a common mistake that nearly every shop makes.

[texas_law_dog]

Note that the M16 blueprint requires the buffer and pistol grip holes to be threaded after anodizing.

Great answer. Thank you.