The vertical grip couldn't be obscured. You'd clearly see it as you do the horizontal stock. The US military didn't have them in WW2, just the horizontals...interchangeable with the M1. You can actually SEE the forestock tennon in the pic.
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roger
Photo shows a captured Thompson, photo could be Greece ?
Model 1921 actuator on top, barrel with or with Cutts compensator, removable butt stock
Model 1928A1 actuator on top, barrel with Cutts compensator, removable butt stock
Model M1 & M1A1 cocking handle on side, barrel without Cutts compensator, butt stock fixedAttachment 96746
I can understand them taking the weapons for good reason one may have been more fire power as the K-98 with only five rounds leaves a bit to be desired despite being highly accurate but your ammo supply is limited or subject to how many times you over run the enemies positions. No good being in a fire fight if your reduced to throwing stones at the apposing forces.
Gun shows just aren't the same these days.
Those would be Commonwealth then, we had the vertical grips until late. Probably not '21s though...
Soldiers have always pilfered trophies in the form of enemy weapons...if those were taken in disarmament it would make sense why they would be in one lump...
The USMC had some '21/'28s in service that had twin grips, those weren't in Europe though...
Germans in WWII are famous for using only the best weapons of their enemies...from Berthier 1892 to the garand!
there are lot of pictures who prove it:)
Beware the premature end zone dance.