Need Help... AR Competition Upper ID

[Pistol Pete]

Does anyone know the name of the company that makes high end AR uppers for three gun. Jesse Abbate used to use one on her AR three gun rifle but when I google it all I get is pics of her which isn't that bad. It was Mid West or something but there were 4 letters and stated with an M? Any help appreciated. Was something like MNSN or MSDN?

Pistol

 

[LeeEnfieldNo.4_mk1]

Mega, as in Mega arms maybe?

 

[Pistol Pete]

It was MSTN - Mid South Tactical Network... outstanding rifles but the builder seems to have dissappeared into thin air.