Kevin, this rifle is made in Germany by Umarex. Umarex is part of the Carl Walther group of companies and, just like Hammerli, specializes in air rifles and rimfires. Umarex adquired Hammerli in 2006.
While it looks like it has standard AR controls, some of them function differently. The safety can be engaged whether or not the hammer is cocked. The bolt does lock back on an empty magazine, but the bolt stop is just for show. To release the bolt after you’ve reloaded, you’ll have to work the charging handle.
One of the neat features of this rifle is the adjustable gas system. The TAC R1 22 allows you to tweak your rifle if it isn’t cycling properly with ammo you’d like to use.
The trigger breaks at around 8.5lbs, and it will not take a standard AR trigger group, in case you’re hoping to swap it out.
The barrel has a medium contour and is tipped with a birdcage flash hider attached via common 1/2x28 threads, so you can attach a muzzle device if you like.
The upper and lower receivers are both aluminum, as is the free-float lightweight 13-inch handguard..
Stay safe & have a great day!

Hi Kevin and welcome. Yes, this is by the one and same Walther that makes the PPK and yes, uses standard AR controls. Cheers and stay safe!