I once read a description of Krav Maga that said its entire purpose was to disable your opponent long enough so that you can get to your gun. My guess is that Systema or any other "special forces" type martial art would be the same. If you're training military personnel, you want it to be something that can be learned quickly and easily. It wouldn't use a lot of flashy maneuvers, just something quick and dirty and effective.
Knowing next to nothing about the art itself, I'd give it something like this:
Chokehold -- -2 OCV, +0 DCV, 2D6 NND, Grab
Disarming Throw -- +0 OCV +0 DCV., +1D6 to take away weapon, target falls
Grappling Block -- +1 OCV +1 DCV, grab one limb, block
Joint Break -- -1 OCV -2 DCV. grab one limb, 1/2D6 HKA
Martial Strike -- +0 OCV +2 DCV, +2D6
Takedown -- +1 OCV +0 DCV, +0D6, target falls
You're not gonna get the big, powerful strikes that you'd get from Tae Kwon Do or any of the other flashy striking arts. It's not that type of martial art. I just pulled a bunch of combo moves from Hero Designer, moves that do more than one thing at a time. So most everything does a little bit of damage in addition to letting you grab somebody or put them on the ground. If you're fighting somebody of equal Dex and Spd, that's a big advantage. It gives you more control over the fight. And remember, your goal isn't to out-kick the karate guy, it's to break his hand so you can go get your gun off the ground and shoot him.