UTS -15 Help!

[NCD]

Happy New Year gunnutz. Have a questions about my Utah UTS 15. I am wondering how I can tell what generation of this weapon I have. Is there any indications and or markings that separate the generations. I've checked out other forums and several youtube videos and I'm not getting any answers. I was hoping I would have better luck on here.
Thanks.

 

[GunNutz007]

Gen 4 has the spring assist pump and aluminum gearbox and all the changes from Gen 3
Gen 3 has a metal selector switch (Gen 2 and Gen 1 are plastic), a magnesium top rail (Gen 2 and Gen 1 are plastic), the welded ring on the barrel is approx 1" wide (2 narrow rings on Gen2) the loading ports sections are metal (not plastic), the labeling on the side for the light/laser had an on/off and now the markings are laser/off/light
Gen 2 and Gen 1 are hard to tell apart and other than the height of the sights that come with them (there may be other differences, but I'm not aware of them)

 

[NCD]

Gen 4 has the spring assist pump and aluminum gearbox and all the changes from Gen 3
Gen 3 has a metal selector switch, a magnesium top rail, the welded ring on the barrel is approx 1" wide (2 narrow rings on Gen2) the loading ports sections are metal (not plastic), the labeling on the side for the light/laser had an on/off and now the markings are laser/off/light
Gen 2 and Gen 1 are hard to tell apart and other than the height of the sights that come with them (there may be other differences, but I'm not aware of them)

Thanks GunNutz007 this great info, I think mine is a gen 3.
cheers.