The Inland may go in "Harm's Way" again.
The AR-10 would have to have the same hideous non-pistol grip.
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Let Me Get This Straight....
You are going out into the bush, at night, by yourself, with a bad shoulder, to protect a strategic installation against possible Islamic terrorists, and you will certainly encounter mountain lions and 500 pound bears, and you may encounter Mexican drug cartel tending or transporting the crops, and you are trying to decide on whether to carry a 75-year old WWII surplus carbine of very limited ballistic effectiveness and unknown physical history or a little AR-15 CAR with a near-pistol length barrel and a ridiculous little brush and/or gear snagging grip 'hook' on it, that only functions abouit 80% of the time. This does not sound good to me.
It's been 40+ years since I was in a similar position where my life depended on my rifle so I may not be up to speed on what's actually available to you out there. But, if my shoulder couldn't handle an M1A, STG or FAL in .308 then I would probably get a new Mini-14 in 7.62x39 (or 5.56mm) and put a 0-power night vision scope on it, and 1000 rounds through it, before I went where you're going. But that's just me. Good luck, God's speed and Semper Fi.