I wonder what the idea behind the stock having so much of a downward angle was? Seems like the recoil would make it kick the barrel more upwards instead of back into your shoulder.
it might have just been inherited from the Thompson, which these guns were apparently derived from
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As for why the Thompson had it - part of it was probably just it being an early submachine gun and people still working on figuring out how to actually properly design them. You kind of need that drop in the stock for your face to line up properly with the sights:
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Of course, if you simply had the sights higher up you could have a straighter stock - but at this point, infantry doctrine still heavily emphasized fighting from a prone position, and so having sights be positioned lower so you didn't have to stick your head out too much was considered very important. This reasoning is why we also see so many guns from this period with side and top magazines - too long of a magazine on the bottom would interfere with sticking close to the ground. The BAR was only issued with 20-round magazines, despite higher-capacity magazines existing and other LMGs of the period like the Bren & DP-28 having higher capacities, likely because those would just be too long to comfortably use with the intended doctrine.
Aside from all that however, I think it may have also had something to do with tucking the gun under your arm. While these days we generally dismiss the notion of shooting without sights, at the time this was actually practiced in certain contexts - there was even a fancy term for it, "point shooting" (although that seems to refer to more specifically fast-draw techniques, where the idea was to just shoot as quickly as possible in self-defense scenarios, while in the military context shooting from the hip might be more so related to laying down fire while advancing, which is instead referred to as "walking/marching fire")
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Second photo with the troops firing from a supported position does look like it makes sense for that style of stock.
Firing from the hip makes sense when clearing trenches or when you're actively "on point" in an infantry unit moving together. You're not going to take the time to aim, you're just spraying and hoping that the rest of the squad can take the time to aim at whoever you've managed to scatter.
That last shot of the soldier with the Bren (?) makes me think of the "walking fire" intended for the BAR, as does this whole point-shooting concept. Rad as fuck.
More ergonomic for popping up and spraying over cover maybe? Idk, there's gotta be a reason
Something seems so wrong to me about an automatic without a pistol grip. I know it's because you're supposed to fire these types in controlled bursts rather than spraying a trench or something but it looks so goofy
Some people in ban states or who just feel like it put R870-style stocks on their ARs, to the point where a company started making them like that. I find them jankily charming
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