[DrHenley]

Yep.
And you can use your 5.56 mags with it. A 30 round 5.56 mag is a 10 round 458 SOCOM mag. (that was one of the design criteria for the SOCOM round)
Just whacked a doe with mine. Mild load with 300 gr Ballistic Silvertips @1750 fps. At 95 yards it plowed through her shoulder like a runaway freight train. I can safely get those bullets up close to 2000 fps in the 16" barrel but I wanted to try the mild load first because it was equivalent to my 45-70 load. The 45-70 load uses 300 grain hollow points which don't reliably feed well in the AR. The Ballistic Silvertip has a round nose that feeds perfectly in the AR.
It turns an AR-15 into a bona fide big game rifle! You need a hefty recoil pad because it hits like a freight train on both ends, LOL. Unless you are shooting subsonic then it's a teddy bear.