Fábrica de Itajubá’s first SMG prototypes – Part 3
In 1978, three years after Brazilian Army’s Fábrica de Itajubá (Itajubá Factory) had become part of the IMBEL – Indústria de Material Bélico do Brasil conglomerate, the unit’s Oficina de Protótipos (Prototypes Workshop) decided to give the earlier 9x19mm C.E.70 submachine gun design some additional modifications. The first resulting test specimen, tentatively designated M978, kept the basic wooden lower receiver and firing mechanism topped by a rectangular upper receiver housing a similarly-shaped, heavier bolt, whose longer displacement distance was aimed at reducing the weapon’s cyclic rate of fire. This was finally achieved, coming down to a more reasonable figure of 600-700 rounds per minute. A new, non-reciprocating charging handle made of light alloys was added to the top of the gun, this featuring a wide U-shaped configuration so that it did not interfere with the use of the sights. Empty cartridges ejection was also moved to the top.
An ensuing M978 was completed sometime during the second half of that year, being the last model to make use some C.E.70 components in a somewhat modified lower receiver, the first-noticed change being the moving of the magazine housing to a position closer to the trigger guard, and this resulted in part of the 230mm barrel becoming partially involved by the also-redesigned rectangular bolt. A one-piece, wooden handguard was added to the forward end of the gun.
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via The Firearm Blog http://ift.tt/ywCWoj
November 9, 2017 at 04:20PM