There are three distinct gas blowback Colt 45 pistols that Marui makes - M1911A1, MkIV Series 70 and the MEU. While they are all very similar, especially the M1911A1 and the Series 70, there are some distinct differences.
Essentially, the Series 70 is an updated M1911A1 and the MEU is a modern 'pimped' 1911. The Series 70 is an updated 'civilian' M1911A1 and indeed both guns are very similar. The main obvious difference is the colour - the Series 70 is black with a silver chamber and the M1911A1 is a parkerised grey finish with black controls and black chamber. The Series 70 has a Colt medallion in its slightly lighter brown checkered grip and updated black hammer with flat silver sides whereas the M1911A1 is more business like with a simple dark checker and broader profiled black hammer. The safeties differ slightly with the newer gun having a smooth curved lever rather than a small button. Both guns have the curved main spring housing although only the M1911A1 has a lanyard loop. The other differences are more subtle. The notch on the rear sight on the Series 70 is deeper and the front sights have very slight differences, although the blade profile is the same. The operating surfaces on the trigger, hammer, slide release and magazine release are finely checked on the M1911A1 whereas the Series 70 and the MEU are grooved. The beavertail on the Series 70 is a slightly different profile but it's very subtle.
The MEU is certainly a Colt 45 but the differences on this gun are more pronounced. A large, upswept beavertail, skeletonised hammer, large silver match trigger, wrap around rubber like grips and an extended magazine with a protruding plastic bumper are are the most obvious. Novak rear combat sights, a taller front sight, dual safety and
