All C stock snipers? No scant stocks? Or are you just saying the unertl mounted guns were all C stock?
The Marines had never acquired Scants when they started to produce the Unertl Snipers in Jan 1943. In fact the Fleet force Marines had even avoided the Army C stock, only taking them when they absolutely had no other choice during WWII. But before WWII the Marines would actually take GG Straight stocks that had up to two breaks, and would repair them, over taking new C's.
All evidence points to the first Unertls made, they just used whatever stock was on the rifle when it was pulled from the crate to mount the scope. In May 1943, it was recommended that all future builds of Unertls would be built with C stocks. But it is doubtful many were made after this date.
Since all started life as a Marine NM team rifle, or Special Target rifle (former Marine NM team rifle rebarreled by the Marines at Philly). The C stock would have been the most common since all NM had a C stock since 1928.
Most of the Unertl snipers we find, are from the NM orders to the Marines in 1937 and 1940.
Even though basically every Marine Sniper we find started out life as a 1903A1 National Match. The Marine teams did have guys that preferred the straight stock. So some were restocked to the Straight. We have pics of team rifles with these, plus existing examples with the team mods, and mentions back in the day.
Also the Special Target rifles i spoke of earlier were used in all Marine Divisional Matches and many of them would have been restocked with a straight stock because the regular Marine force had never used a C.
I can only think of one real Marine Sniper rifle I have seen that had a Scant. But we all assume it was acquired at a later date then build. Whether much later in life in the Marines, or in the civilian World.
It's hard to know for sure where it picked it up.
When I first started to research the Unertl snipers almost 10 years ago now, all experts said they all had C stocks. No exceptions. In fact some real rifles were disqualified by these experts because they didn't have a C.
I started to put a lot of research out on them, and now days you never see anyone say that. Which I'm very glad.
I actually have a straight stock Sniper. That is why I am so passionate about this. My rifle was one that some experts disqualified because of the straight stock all those years ago. Now my rifle is seen as a Gold Standard that many are compared to.
That is why when I see a straight stocked clone, I get a real big kick out of it. Because I just think back how those experts told me they didn't exist.