The M1 Super 90 is a 12 gauge shotgun in Syphon Filter: Omega Strain.
"This is a high end semi-automatic combat shotgun constructed of stronger materials. It is easy to load the 7 shells into the weapon and the action is very fast, but the recoil is rather extreme making this weapon difficult to control in rapid fire situations."
-Description from Omega Strain
In game uses
This shotgun is earned by obtaining the Intermediate Team Efficiency Specialist rating. Generally speaking it is superior to other shotguns because of the 7 shell clip capacity; however, single shots should be used for close range combat. Thus this weapon is best used with an accurate SMG and a pistol with good range.