I'd like them even more than I do now!
Yes, that is exactly what you think it is. It's a .177 caliber upper for an AR-15. You can buy a compressed-air powered upper that shoots .177 pellets for your evil black rifle. How freakin' cool is that?
And there's more!
This is getting to the point you think about buying a AR just for all the crap you can add to it.