Buffer Tube Ridge?

[Hulkstr8]

Hey guys,

I put my lowers together over the past month and noticed on my buffer tubes that somehow a ridge has formed between the castle nut and the rest of the tube. Across the three lowers, they all have the ridge but to varying degree of severity. I'm gunna try and post a pic of it below. Is this normal?

Edit: Also, the buffer tube is LaRue (I'm still waiting for their CS to handle my problem, it's been 4 months). QD Plate is Impact Weapons (I think it's the best QD plate and the CS from Earl is fantastic). Castle Nut torqued to spec.

Also, I ran my fingers inside the buffer tube and it doesn't seem to affect the inside of the tube.

[hk_shootr]

Haven't ever seen that before.....

[Hulkstr8]

Yeah neither have I.......

I wasn't doing anything odd either, just Geissele Reaction Block, Magpul Wrench, and a torque wrench.

[jackblack73]

I'm betting the ridge was already there from manufacturing, you just didn't notice it before. LMT tubes have a similar ridge, although the location is slightly further back.

[BFS]

Looks like your tube was turned in a lathe prior to thread cutting.

Most tubes have rolled threads, not cut, hence you might never have noticed before on other tubes.

Your tube is fine.

[hk_shootr]

I'm betting the ridge was already there from manufacturing, you just didn't notice it before. LMT tubes have a similar ridge, although the location is slightly further back.

This is what I’m thinking

[Hulkstr8]

Okay, I wasn't sure. It seems strange that the ridges are either bigger or smaller depending on the buffer tube.

Is there any inherent benefit for cut or rolled threads?