So they are on sale at Palmetto, I have a Gen1 on one of my other AR's.

This one is the Gen2, but it doesn't come with all the parts needed.

https://www.primaryarms.com/Ma...lapsible-Stock-Black

NOTE: The UBR GEN2 includes a custom receiver extension tube, buffer spacer, and mounting hardware. A carbine buffer and spring (M4 or SR-25 length) or A5 buffer and spring are required for use and are not included.

So is it worth it without the other parts, and then on to my question where do I buy those parts (I know this is hard to believe) but I am not the greatest AR mechanic

OK can't tell you a thing about the UBR gen 2 as I don't have one. I also have a gen1 and it isn't my favorite. But I think the second part of your question if I understand it is where to get a carbine buffer and spring (you didn't say caliber so this will matter when shopping). but practically the answer is anywhere. really anywhere. Any decent online site will have them like brownells or midwayusa. Sites we don't mention by name have them. heck even local retailers have them. There are std ones, better ones and super ones. But you can get one everywhere.

Believe that is the way they ship. Makes sense based on all the available buffer springs and buffer weights. If you don’t have an opinion on the combo you like, you’ll need to research the topic. Example link below. No affiliation. Once you know the specifics of what you want, an internet search should lead you to a retailer, etc.

https://www.wingtactical.com/b...fers-buffer-springs/

That's how they're supposed to come.
They're meant to be a replacement for buffer tube & stock.
No matter what other stock you buy... you'd still need to get a buffer and spring - and a tube for that matter.

Special note:
The tube they include is defined for the A5 buffer system.
If you go to use a standard carbine buffer system, you MUST use the included spacer or you're gonna have nasty cycling issues.

I have the Gen I and like them very much. Never had a chance to snag a GenII yet.

Wish I could help, as I have a rifle with the first gen UBR on it but no experience or knowledge on the second gen. Tagged to learn more from others, and wish you good luck on whatever you do.

I have gen 1 on all my AR s. them for they are tanks some will frown on the weight because they are heavier than most on my Sig 716 I had to put a Gen 2

For those who have both, does the Gen 2 feel as rock-solid and sturdy?

I have a UBR Gen 2 and love it. This is on my Valkyrie build. I used the JP Silent capture spring for my buffer. I don't have a Gen 1 but this thing is solid with zero movement.

I've several but they are all Gen 1, just what is the difference between them?

quote:

Originally posted by kimberkid:
I've several but they are all Gen 1, just what is the difference between them?

Weight primarily. They look at a little different but I think the main goal was same function in a lighter option.

quote:

Originally posted by P220 Smudge:
For those who have both, does the Gen 2 feel as rock-solid and sturdy?

Absolutely. Maybe more so, If thats possible.