The IMBEL MD is a series of Fully automatic Assault rifles that are used by the Brazil military as their standard issue. The guns resemble the Belgian FN FAL design but there are a number of differences between them. The most notable being chambered for a different round, 5.56x45mm NATO.
The MD-2 and MD-3 rifles are the result of redesigning the FN FAL to use the 5.56x45mm NATO round in place of the FAL's 7.62mm NATO chambering. The MD-2/MD-3 series externally resembles a short-barrelled FAL, but with an M16 magazine. Early MD-1 prototypes retained the FAL-type tilting bolt with a locking shoulder immediately behind the magazine well. This was not found to work well with the 5.56mm round, so subsequent prototypes and the final design incorporated an M16-type 7-lug rotating bolt into the design. The FAL's short-stroke gas piston, which is actuated by gas bled from the barrel via a vent located in the foresight housing, and which impinges upon the separate bolt carrier, is retained. Feeding is from STANAG 4179 M16-compatible magazines. The versions differ in that the MD-2 uses the side-folding buttstock from the FN FAL 'para' variant, while the MD-3 uses the fixed polymer stock of the standard FAL. The MD-2 series contains many FAL-derived parts, some of which remain interchangeable with the original FAL, and others which are modified to suit the new design.
The IMBEL MD-1 is the Prototype of the MD-2. First introduced in 1983 this gun would be put through vigorous testing before being updated into the Later MD-2 and MD-3 Rifles.
Introduced in 1985, the MD-2 was a further developmend of the MD-1. This rifle would replace the IMBEL LAR, a licensed copy of the FN FAL.
Updated IMBEL MD-2 with various new changes.
The IMBEL MD-4 is a shortened carbnie version of the MD-2.