I picked up a 6920 and 6721 each from different local shops in December right before the markup. Since then I haven't been able to find anything at all locally and some of the prices on GB make me nauseous... Not to mention all my go-to online stores are all out.
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Bought a LE6920 in December from Cabelas using some Christmas gift cards they had 6 in stock at the time.
The first time to the range I put 200 rounds without a problem and just needed 2 clicks to the right using my carry handle sight.
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Both my 6920s were the same way, just needing two clicks right. My 6721's zero is actually it's mechanical zero. First time I've had a rifle that didn't need any sight adjustment
ETA: OP, if you don't care about the "M4 Carbine" roll mark I would highly suggest the 6720 or 6721. Those are the lightweight and HBAR versions respectively but if you're swapping for a SOCOM, it'll be the same thing as a 6920 just with a different roll mark. Also the 6721 has no mention of the barrel profile or contour on the receiver, they just read AR15 A3 Tactical Carbine.
I'm still seeing decent prices on these as they are less popular models.