Help with 2011 magazine tube identification

[Posvar]

Do these look like old style SV tubes?

 

[Jfitz427]

They look like old SV mags, which is great. Really good mags. But at the same time they look like sps mags because the rib goes so far down to the base of the mag . If you look at this pick, from left to right, the mags are

 

SV, SV, SPS, STI. 

 

And as you can see only the SPS mags rib goes all the way to the bottom. The SV mags rib stops like 1/2-3/4 of an inch from the bottom. I have two sps mags and they’re great. 

 

[Posvar]

Thank you. I’m thinking/hoping they are SV. In your pic the basepads look like the thin Taran pads. My pic they are super thick plastic pads of some sort (maybe STI). If the thinner pad was installed it would look just like number 29 in your pic and I seem to think the rib would be pretty much covered up if same pad was installed on SPS tube. I’ll find out soon enough. Fingers crossed.