Just trying to finalize what I’ve got before the next panic. (and maybe yourself, too)
Looking for versatility here. Optics can easily be changed of course.
If you had only two AR’s (5.56) what barrel lengths would you want?
How about three AR’s?
For example would it be an 11.5 and a 20 in? And if you chose three would it be two 14.5’s and a 20?
Would any of them be a 20 in or 11.5?
I’m having a hard time narrowing this down myself.
Well I only have two right now, one is a 16in Mid length, and the other a 16in Carbine length. If I was gonna get a third I would go with a 20" classic rifle build. But right now im looking at getting a .308 AR, preferably with 18" barrel.
also, do you think there is another panic on the horizon? I dont think there will be one for a while, in fact if there is I will be happy cause i can sell some things for outrageous prices haha. 
Possibility is always there.
Knowing what I know now, 12.5" barrel for a great general purpose rifle. Equip it with a high quality stainless steel barrel that has been lead lapped, with concentric threads, and quench-purge-quench treated, as well as a spare upper in the exact same size and configuration. Throw a Noveske Switchblock on both as well as a Saker 7.62 can with the 5.56 cap.
But that is going a little too detailed so yeah, 12.5" in Pairs.
My 12.5 with a can is the same overall length as my 14.5.
Those two are my favorites.
I have all length barrels except 13.5 and 15.5 because they don’t make those sizes. 
BCM 14.5 middys. Then an LMT 10.5" MRP.
:o
I would have a LMT 10.5 and two Bcm 20".
Two = a 14.5" with pinned MD and an 18" SPRish precision rifle
Three = add a 10.5 or 11.5" SBR (or pistol with SB 15 if unable to SBR).
10.5, 14.5 and 16
I meant to say a 16" middy too.
10.5 and 14.5 are my main choices.
Suppressed 11.5" SBR
Midlength 14.5" General Purpose
Intermediate 18" SPR or 16" .308 Battle Rifle
11.5 and another 11.5.
Or…
11.5, 11.5, and 16.
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I’ve gotta go with this.
I have two- 16 & 20
I will be adding a third- 10.5 and hope to get a suppressor for it
The three barrel lengths I see as useful without redundancy are 10.5-11.5, 14.5-16 and 20
An SBR to double stamp (probably 11.5") and a reasonably accurate mid-length gas carbine (14.5" or 16").
10.5 suppressed cqb and 16 precision
I have several. My 11.5" is my primary daily driver. I also have a couple of 16"'s, 20" and a few spare complete uppers. Even if you don’t get complete carbines just having completed uppers is smart since you can only shoot one at a time (unless you are arming others). The 16" is almost a necessity due to the ability to move it almost anywhere.
Ammo prices are coming down and I suggest getting what you can.
If I could only choose 2 it would be a 11.5 and a 16" mid a close second would be a 14.5 mid.
The 16" is about as effective as an 18" and the 20" is just to long for my tastes though the 20" shoot the best IMO.
If I could only have 2 it would be a 20" rifle “SPR” and a 11.5" carbine “SBR”.
For a 3rd I would have a 14.5" midlength, and that would be my choice if I could only have one as well.
ETA: All would be setup to be lightweight rifles, and especially the “SPR” cause that’s what I would carry in the mountains here in CA.