not SDM or "sniper,"
What? There's the G3SG/1, PSG1, MSG90, HK33sg/1 and a few others, all based on the roller-delayed blowback design.
Yeah, they basically took what were their standard issue rifles and made some small changes and came up with a sniper rifle. I think that proves my point. Try doing that with an AK. They build guns that are high precision and most agencies that use them use them for relatively low precision work.