STI tube identification

[CaptRob]

I purchased 2 140mm STI magazine that were suppose to be for a 40sw. I have never been able to tune them to work and now am thinking that they are for a 9mm or 38super. All my other 40sw tubes just have the 2 indented ribs on 1 side where these 2 have them on both sides. Looking for someone that is familiar with the 9mm and 38super tubes to confirm this for me.

Thanks

[wgj3]

Use the feedlips as your guide. See if they will hold a 9mm or 38 Super round. If so, you have 9/38 tubes. If no, probably 40's. All my STI .40 tubes have dual ribs on both sides of tube. But, feedlip dimensions will tell the story.

[Ultimo-Hombre]

I have talked directly about this with a tech from sti. He told me there are two types of "dents" on thier mags. "Shallow" and "deep" a .45 mag has " shallow" dents both sides. A .40 mag has "deep" dents on he left side and " shallow" on the right. Finally 9/38 mags have deep dents on both sides. The feed lip demensions won't tell you much if they have already been monkeyed with. The dent thing was the intel I got directly from STI with this same question.

[CaptRob]

Well that would explain why I never could get them to run right with my 40.

[blue edge]

I have talked directly about this with a tech from sti. He told me there are two types of "dents" on thier mags. "Shallow" and "deep" a .45 mag has " shallow" dents both sides. A .40 mag has "deep" dents on he left side and " shallow" on the right. Finally 9/38 mags have deep dents on both sides. The feed lip demensions won't tell you much if they have already been monkeyed with. The dent thing was the intel I got directly from STI with this same question.

Good info Thanks

[67ls7vert]

So, What are they for?

[CaptRob]

So, What are they for?

9/38