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Fal Flash Hider Machine Drawings5/3/2021
The gun was 940mm long and weighed 3.9kg. For eventual use by law enforcement agencies using semi-auto pistol-caliber carbines, an option would be fitting the 211mm barrel of the MD2 subgun.The idea was, of course, using off-the-shelf FAL parts (unchanged andor slightly modified) in their subgun designs so that development time could be abbreviated and production costs, pretty much reduced.
Heres a brief account of the SMGs that were built and tested by IMBEL in the late-1970searly-1980s period. Its more obvious external relation to the rifle could be noticed in the use of the same synthetic pistol grip and trigger components, and a deeper examination of its guts would show some other minor components of common use. In addition to that, the upper and lower receiver (firing mechanism housing) swung open in the same FAL fashion in the early field stripping process. The blowback weapon fired from the open-breech position with the firing pin machined on the bolt face. The external portion of the 215mm barrel was fitted with a perforated metal jacket. The earliest prototypes employed a machined upper receiver with a pressed steel cover on it, but follow-on examples had a single stamped receiver with 1.2mm thick walls. This resulted in an overall gun weight reduction of 300 grams to about 3.6kg, in addition to having cut down workshop work from 43 to 19 operations. The wooden handguard was reshaped in contour and received wider longitudinal grooves instead of the earlier, narrower transversal grooves. Overall length of the MD1A1 was 730mm, reduced to 495mm when the stock was folded. Like most IMBEL subgun prototypes it used 20- and 30-round staggered-row, two-position feed magazines, and employed the basic FAL pistol grip and trigger group. Most of the later prototypes, as the ones illustrated, used a stamped upper receiver. Gun weighed about 3.5kg and offered a cyclic rate of fire of 600 rounds-per-minute or so. It worked well enough to be approved in Brazilian Army official tests. The new prototype guns employed 90 parts common to the 7.62x51mm rifle, which translated into about 80 per cent shared components with the rifle. This included the whole machined lower receiver, firing mechanism and three-position fire selector, resulting in the guns becoming closed-breech, hammerfiring pin-fired weapons, a bonus when it came to more accurate semi-auto fire. The hard-chromed barrels (four grooves, RH rifling, 1:254mm pitch) were available in two lengths, 211mm (muzzle velocity: 400 ms) and 160mm (360 ms). The longer barrel was usually fitted with an external perforated sleeve and a flash hider with the same dimensions of the FALs, and thus allowing the fitting of the rifles bayonet Although the practical usefulness of such an item for an SMG is open to question, I was told by the IMBEL guys at the time that this had been actually required by one of the potential costumers, possibly for guard duties, so this accessory was made available. Note plain (no perforated sleeve) barrel with an elongated mounting nut. Firing from the closed-bolt position was a bonus for accuracy in the semi-auto mode. Barrel was the habitual 160mm-long unit, but the 211mm variation could easily be mounted on gun if the operator so wished. The staggered-row, two-position feed unit had inspection windows in the 10-, 20- and 30-rd positions. The gun was 940mm long and weighed 3.9kg. For eventual use by law enforcement agencies using semi-auto pistol-caliber carbines, an option would be fitting the 211mm barrel of the MD2 subgun.
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