Saiga .223 that takes AR mags
Glock 19
Toss-up between Mossberg 590A1 and Ruger 10/22. I guess it would depend on what necessitated the downsizing.

M9
M4
M24

For me
1;  Colt 1911  45acp   As my carry piece.
2;  Ar10/LR-308 A2 Carbine  7.62x51/Win308
3;  Win Model 97 Trench Gun  12gage
For the Wife
1;  S&W model 59  9mm  As my wife’s carry piece.
2;  Ar15a2 Carbine  223/5.56mm
3;  Win. Model 12  12gage

I cheated too.

Browning Citori CX
Glock 19
Remington model seven SS 260 Remington

Sig P250 with 9mm and .45 conversions
Ruger 10/22
AR-15 with various uppers.

AR, SKS, Hi Point 9mm carbine

From the hip without too much thought.

Glock 19
High end AR in 6.5 Grendel
High end bolt action in 6.5 Creedmoor

16" AR

Glock 19

870 with 18" vent rib barrel, with screw in choke tubes.

The only thing that would suck is if I had to conduct long range operations against high value targets or if I had a sniper trying to neutralize me, and I had no way to tactically counter engage him at the distances he could engage me at.

Henry .45-70
Henry golden boy .22lr
Mossberg 500 12ga

Yikes PA sounds like it has gone downhill since I was there last.

If had to ditch all but three of my guns I’d keep.
KAC SR15
G19
Model 700 .300WM

1. AR
2. Glock 19
3. Precision/long range rifle in 308 or 6.5 Creedmoor

My frankenbuild ar15
Glock 17
Remington 870 xcs

But if I could squeeze in one more it would be my

Arsenal sam7sf.

For the wife

Colt 1911 45acp
Glock 26
Remington 700 30-06

AR15
10/22
28-2

(Really having trouble deciding for sure on the handgun, though. Maybe a Shield 9, instead, for something always handy to carry. Or...maybe even a clunky old Ruger P95 - always dependable and can use it for a framing hammer if I need to.)

Ok, I am gonna change my picks...the anxiety is starting to get to me, I keep thinking of scenerios that I am totaly outranged by multiple enemies and I am literally shaking.

Here is my new pick
AR15 16"
Glock 19

700 in 6.5 CM

I don't want to die just so I can shoot some turkeys or geese...it's simply not worth it to have something that's basicly useless for anything other than getting food and not having something to deal with serious threats like snipers.

LMT L129A1 Reference Rifle with multiple barrels.

LMT New Zealand Reference Rifle with multiple barrels.

Glock Gen 5 19.

Tavor SAR
SCAR16
M&P 2.0 Compact 9mm

G42, with a Technaclip and kydex trigger cover. Throw a teeshirt on top. Thank me later.  My Technaclipped 42 hangs on my gym shorts. A similarly equipped 43 should hang on those board shorts with no issues if the drawstring is snug.

MK18 .300blk w/Omega 300
SP5K SBR w/Omega 9k
Glock 43 w/Gemtech Aurora II

if I'm wearing a shirt i can conceal the Glock 19.

Colt 6920
Sig Sauer P226
Remington 870

Tough.

.308 Remington Seven
12ga Remington V3
Sig P226 Legion SAO

If it's three guns I currently own?

Great Grandaddys first year wingmaster 870
My 16" AR
Smith 686 6"

AR15 pistol
Glock 35
My hand-built 1911

SR15, SR25, P226.

Well, of what I have I would take:

Lever and revolver .45 Colt.

Lever .22 mag.

SCAR 17

AR15

Glock 17

No way I could only have 3 guns though. That would be the Apocolypse.

My GA Precision .308
Benelli LH SBE
Kidd 10/22

That will work in Dallas.

I've been like that.
1. Lever action 30-30
2. Semi auto 12 gauge like my 590
3. Glock 19

If I were to stay where I am currently at:

Assuming I could use multiple uppers I would keep my mid length BCM upper on my S&W lower and buy a .300 BO for hunting and a .22LR conversion kit for low cost plinking.

Glock19 Gen4.

Mossberg 500 and a few different barrels.

If I were to move out west I would probably change the rifle out to a .308 or lose the 12 gauge and replace with a .308 bolt action.

Really its location and terrain dependent.

Win Mod 94 30/30
S&W Mod 19
Henry lever 22 carbine

SCAR 17

Barrett M2A1

Benelli M4 Super 90

If I was still in CA this would probably be close to what I would have if there was a three gun rule.

Glock 17

Ak47 milled in 7.62x39

Mossberg 590a1 milspec version

I see wat u did.

G19
16” ar in 556
Ruger 10/22

Takedown 10/22

18" 6.5Grendel (with all my other uppers because them ain't guns),

Tanfoglio limited elite 40 cal,

and my M&P9c concealed on me (which you wouldn't know about because concealed is concealed).

10.5 suppressed SBR
Model 700. 30-06
HK USP45 suppressed

16" AR in 6.5 Grendel, prism and LPVO on QD mounts
M&P 9 Compact with light, laser, and MRDS
12ga 870 with bird and slug/defense barrels

M&P Shield 9MM
14.5" Pin Weld AR15
Italian O/U clays gun (Beretta/Perazzi)

Horrible choice- only three guns?! What is this Europe or something?

- Mossberg 590 with 835 barrels for hunting
- .308 bolt gun (the nicest I could afford, hell at only three guns this would be pretty nice)
- SP101 in .357, 3 inch barrel

Holy crap I’m a fudd in this crazy three guns only universe!

Rethinking this:
Mossy 590 with 835 barrels field and slug barrel.
AR with 5.56, .300, and .22 uppers
G19 with .22 conversation

11.5" Noveske SBR in 5.56
10.5" Noveske SBR in .300BLK
One of my 9mm handguns (I'll have to think on that).

I don't dress like that in the summertime.  Only when I'm going to actually be swimming.  Maybe lounging around the house without company or something.  So not a problem for me.

As for my three guns, if it has to be three that I currently own, as-is:

FAL
Ruger 10/22
FN Hi Power

If I could get a .22LR conversion for the FAL before I had to limit myself to three, I'd ditch the Ruger in favour of one of my lighter-weight bolt-action rifles or my Mossberg 590SP; not sure, exactly.  For rifles it'd be either my Lee-Enfield No. 5 Mk I or FR-8, leaning towards the L-E.  I'd eventually get a .22LR conversion for the Hi Power either way, and maybe a compact Argie slide to make it easier to CC.

If I could get whatever three guns I wanted regardless of whether or not I own them currently:

Lightweight FAL build with para and fixed-stock lower assemblies.  I'd have it fitted with a switch-barrel set-up like the ones Vern Smith used to make.  5.56 conversion along with the primary 7.62mm components and a .22LR conversion.  SBR-length barrels if I could do it legally at some point (with suppressors).  If I can get the parts or have them made (magwell adapters and bolt groups, along with barrels set up for the switch-barrel conversion), I'd also do something along the line's of Smith's conversions for 7.62X39 and 5.45, maybe a couple of other calibres.  But I could settle for just 5.56, 7.62 (and any cartridge in that family), and .22LR.

Custom M1911 pistol in .45 ACP with slides, mags, etc. for other calibres (including, but not limited to, 9mm and .22LR).

Combination gun with multiple barrel sets and einstecklaufs (insert rifle or shotgun barrels for use in shotgun barrels).  The main one would be a combo .22LR/12 ga.  I'd have centrefire rifle setups, too, including ful-power small and medium bore cartridges, and maybe a set to give me a heavy double rifle if possible.  Obviously another custom piece.

Not too many things for which I'd need a small arm that I wouldn't be able to do with those three.  Long range and anti-material stuff and deep concealment would probably be the main things.  For some things what I'd have wouldn't be optimal, but serviceable (like hunting).  Everything else, no problem.

Mossberg 500
AR15
S&W M&P 2.0 Compact 9mm

Awfully hard to just pick 3. Out of my own stuff, here's what I would say-

Sendra M16
Remington 870 12ga
S&W Shield 9

I would have about 20 different uppers for my M16. Probably an 11.5", 16" and 20" in 5.56, 20" 6.5 Grendel, 18" 6.8, 16" .450 Bushmaster or .50 Beowulf, 16" 7.62x39, 8" .300 Blackout, 4" and 10.5" 9mm, 4" and 16" .22lr, 24"-26" .300 WSSM upper, .50BMG bolt action upper, Freedom Ordnance 9mm beltfed upper, Lakeside Machine/Lithocore X .22lr beltfed upper and Fightlite MCR upper. Should pretty much cover me for all scenarios.

AR-15
My favorite bolt gun in 30-06
Remington 870

Assuming that I can either use diffent uppers or a .22 kit:
AR
G19 or CZ P07
870

If not
.22 rifle
AR 5.56
G19 or CZ p07

Long range: Savage 10, w/ SWFA 10x42, .308

Mid range: AR15 with Primary Arms 1X6 ACSS scope,  in .223

Handgun: Smith Wesson M&P 45