One of the first modern concealable pistols to hit market in 1996 had a 10rd 9mm single stack mags available. We had them available in the service.
http://www.americanspecialops.com/special-ops-weapons/sig-p239.php
Of course, it is new and Glock has a huge following.
The SIG Sauer P239 is a semi-automatic pistol designed and manufactured by SIG Sauer, GMBH and SIG Sauer, Exeter, NH. ... The included single-stack magazine has a capacity of 8 rounds (9×19mm) or 7 rounds (.357 SIG or .40 S&W). As of 2018 it has been discontinued in the US market.
BUT you said -No Impact'..so I guess there is a 'little' one. And USN Navy Seals..now use? Yikes, the Glock 19..but what do they know..