I was seriously thinking about getting an AR-10 lower when I got a notification they were back in stock. It was an Aero Precision M5 (.308) Stripped Lower that someone else had on sale but was out of stock for a long time. Aero Precision is out too, but they're $170 when they are in stock. I need to figure out what I would do with it if I had one before I commit to buying a lower. A few things I've thought about were 6mm Creedmoor might get me off my butt and interested enough to shoot it, 7mm-08 Remington because it seems to be nearly perfect as a deer cartridge* and I like venison, or 12 gauge like the Genesis Arms GEN-12 upper just because it would be cool to have one, and it's good enough for John Wick, but they're well over 2 grand. So instead of buying a rifle lower I don't know what to do with, I spent hundreds on ammo for guns I already have.
* The .280 Remington is even better than 7mm-08 but it won't fit in a .308 length receiver.
Since my friend is retiring in 2 weeks, we'll have more time to spend at his cabin, and hopefully I'll finally shoot a couple of my guns instead of just hauling them back and forth. I did shoot my X-Fore golf ball launcher while I was up there for my 4th of July vacation. The 3 of us who were there at the time went for an ATV ride and found half of a fiberglass tub surround that someone dumped in the woods on the side of a powerline.

I only had 7 golf balls and used 2 to
try to figure out the elevation hold, but the next 2 went flying so wildly I missed them too. I think they have a random spin when they come flying out the muzzle. So I got closer and blew 3 holes clean through the fiberglass, with projectiles over twice the diameter of an 8 bore rifle bullet.

If a golf ball has enough power behind it to fly 500-600 yards, it could be used as a lethal/less-lethal weapon, but you have to muzzle load them.
https://www.aeroprecisionusa.com/m5-308-stripped-lower-receiver-anodized-black https://www.youtube.com/watch?v=7fDt6a4-qjQ