Quote:
Originally Posted by postino
Have you noticed anything peculiar about sub MG's that fire from an open bolt??? I've fired several, at military FamFire exercises, and was quite surprised...I mentioned it in another thread; when you next visit this friend, fire an MP-40 or Thompson unsupported and tell us/me what you noticed... 
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I've put a few rounds downrange with both open and closed bolt subguns. Not sure what answer wins the prize today but far and away the open bolt guns are less accurate than their closed bolt counterparts and somewhat more awkward to sight in and fire. Of course with all of the things mechanical going on, and all of the moving parts slapping around and smacking into battery before the bullet starts its way down the barrel, kind of stands to reason that the open bolt design is inherently less accurate.
I would have also said they generally have slower rates of fire Like the Thompson and M3 but the MAC 10's spit out a goodly number of rounds per minute. Then there is the crudeness factor but the Tommygun is exquisitely built.
Regards,
Doug