Looking for M4 pistol poses

I think you have a hard time finding some Tom because there wasn't a lot of them shared and made available specificaly for M4.

Also, searching for something like that is hard because Gun poses are ofthen hidden throught other product who are labeled in words not refering specicaly to guns or poses. (Action, wars, combat, ect..ect..ect..)

I did searched a bit for you and here is what i found for now:

PlasmaGun for V4 and M4
https://www.renderosity.com/mod/bcs/plasmagun-for-v4-and-m4/94953/
Available here: https://zonegfx.com/plasmagun-for-v4-and-m4/

Contain half a dozen basic pose for M4. It's not much but i guess it's better than nothing.

ModernWar:Rifles Ultimate Pose Collection for M4
https://www.renderosity.com/mod/bcs/modernwar-rifles-ultimate-pose-collection-for-m4/94530/
Available here: https://zonegfx.com/modernwar-rifles-pose-collection-m96-matlock-for-m4/

Not really a pistol gun but since you didn't specified what "type" of guns you where using....
I was thinking that maybe.....

But if it's really pistol/hand guns you are searching for, i think it's
ModernWar-Guns Ultimate Pose Collection for M4
https://www.renderosity.com/mod/bcs/modernwar-guns-ultimate-pose-collection-for-m4/95332/

Unfortunatly, it doesn't seem available here on the zone. Maybe you can try to find it elsewhere or make a request on the forum here. Maybe someone else have it.
Either way, good luck on your hunt.