Dormin, hard to go wrong with a Kalishnikov if you don't already have one. The AK platform brings a lot to the table, reliability, decent accuracy, and above all- it is cheap to shoot in comparison to an AR-10. The AK has a lot going for it, it is the combination of a Remington, Garand, and German MP-43, all rolled together and in typical Communist fashion, it is cheapened.
The magazines are common, inexpensive, and easy to come by, whereas there is no 'standard AR-10' magazine, DPMS, Armalite, RA etc use different magazines and there are small differences in parts, where as the AK can swap mags and all parts, save for the differences between milled and stamped here and there.
The AR-10 platform from any manufacturer is a great long range dependable platform, but the cost only starts with the rifle, by the time you add optics, collect some magazines, buy it ammo.........the gap widens fast.
The AK is best suited to it's rudimentary iron sights, and is as useable as anything right out of it's shipped box. AKs also can be repaired. As in- weld it up, file it, improvise pins and springs etc. The AR-10 however, is a swap parts until it is right, lot less wiggle room for the future concerning parts availability and repair.
I love both, for a host of different reasons, but off the top of my head between the two- AK...... Or both!
Hope you like the Beowulf- I got 3 and they are a hoot. Recoil thankfully is nothing remotley close to that of the AK.
Let us know what you decide, and remember- this was a solicited opinion
