bass-n-fire

Yes you did. And thanks

I purchased my first AR15 3 years ago and finally got to shoot it about 2 months ago. Loved it. Then decided I wanted to build one. My son in law gave me a complete PA10 upper to start. Now I’m finding out the “AR10” platform isn’t as standardized as the AR15. I’m having difficulty trying to determine which upper I have (gen1,2 or3). Just want to get correct lower. Hoping I can learn some things here

I just purchased a complete PA10 upper from my son in law. It is for a 308 build. He doesn’t know if it’s Gen 1,2, or 3. Are there any identifying marks so I can ensure that I get the correct lower?