Shortround6
Major General
Sometimes there are other considerations, from Wiki so take it for what you think it is worth;
"" The ShKAS machine gun had a high rate of fire but it also had 48 ways of jamming. Some of them could be fixed immediately, some could not. And 1,800 rounds a minute was an insanely high rate of fire. If you pulled the trigger too long, the ShKAS would fire all its ammo in one go and that would be it!!"
The last may be more for flexible guns than fixed. and
"The Shkas was a comparatively intricate and well finished gun, the cost of which necessitated that it be kept in operating condition as long as possible by repair and replacement of parts. In contrast to the Shkas, the Beresin was deliberately expendable, that is, the Soviets' plan was to discard the entire gun after a short period of use during which one or another of the principal operating mechanisms became worn or broken."
If the 12.7 mm UB offered even close to the same target effect as a pair of ShKAS and was cheaper to produce (money, man ours, what ever) and posed less of a maintenance burden it would be picked even in not actually "better".
I don't know how much each different consideration counted but many times a weapon was kept in production/use or dropped for other reasons than target effect alone.
"" The ShKAS machine gun had a high rate of fire but it also had 48 ways of jamming. Some of them could be fixed immediately, some could not. And 1,800 rounds a minute was an insanely high rate of fire. If you pulled the trigger too long, the ShKAS would fire all its ammo in one go and that would be it!!"
The last may be more for flexible guns than fixed. and
"The Shkas was a comparatively intricate and well finished gun, the cost of which necessitated that it be kept in operating condition as long as possible by repair and replacement of parts. In contrast to the Shkas, the Beresin was deliberately expendable, that is, the Soviets' plan was to discard the entire gun after a short period of use during which one or another of the principal operating mechanisms became worn or broken."
If the 12.7 mm UB offered even close to the same target effect as a pair of ShKAS and was cheaper to produce (money, man ours, what ever) and posed less of a maintenance burden it would be picked even in not actually "better".
I don't know how much each different consideration counted but many times a weapon was kept in production/use or dropped for other reasons than target effect alone.