Rheinmetall-Borsig MK 103 was a German 30 mm autocannon that was
mounted in combat aircraft (like the Hs129, Fw190, Me410 and Do335)
during World War II, using a belt feed mechanism.
Developed alongside the MK 103 was the lighter MK 108 cannon, which
had a shorter barrel. It fired the same projectile, using a smaller
cartridge case with less propellant. The shorter barrel made it
more adaptable, so it saw much greater use .
ground use, the MK103 was the basis of the 3cm
Flak 103/38 and the 3cm
Flakvierling MK103. At the same time it was meant to be the
primary weapon of the Flakpanzer IV "Kugelblitz".
The 3cm Flak 103/38 also appeared (probably as a field modification)
on an SdKfz
138/1 Geschutzwagen 38m. There was also a Behelfslafette,
that might not be too difficult to scratchbuild using this set.
not in widespread use by the end of the war, it was without any
doubt a very
A drawing of the weapon can be found here.
differ about the overall length, going from 2350mm  to 2318mm
 and 2285mm .
is inside the Attack box
In the box (or rather, blister) you get two gun bodies and four
barrels. The barrels have two different types of muzzle brake (one
with flat sides and one with individual vent tubes). Both types
can be seen in wartime pictures. The instructions do not mention
this option, though, but show a gun cradle and an ammo box, that
are not provided. I think this is not because Attack forgot to add
the parts, but rather that the instructions are wrong for this set.
My reasoning is based on the fact that the MK103 was belt-fed and
this set is meant for aircraft installation, so there would be no
need for the cradle and box. These parts might however be appropriate
for Attack kit 72852, which is a conversion set for the SdKfz138/1.
While the barrels aren't too bad, they are slightly warped and the
vent holes not perfectly aligned. They are thus no match for Schatton's
metal barrel set (vide infra).
The body on the other hand captures the look of the real gun very
Based on the available information the total gun scales out around
1/70. Given the lack of accurate data, this conclusion needs to
be taken with a pinch of salt, even though I have the feeling that
the relative proportion between barrel and body is skewed, with
the barrel being too long and the body too short, based on the scale
drawings by Arthur Bentley.
is inside the Schatton set
Schatton set contains two identical barrels with a muzzle brake
consisting of individual vents. Both the muzzle and the vents are
hollowed out and are an incredible feat of engineering and will
be a great improvement of the Attack set, even though they don't
come cheap. The whole of the barrel is substantially longer than
those in the Attack set, but measured from the taper at the base
of the barrel they are identical.
When fitted to the Flakpanzer IV "Kugelblitz", only the
constant, narrow section of the barrel and the muzzle brake is seen.
The Schatton set measures 13.6mm in this area, while  (rescaled
to 1/72) gives 13.9mm; an error of only about 2%.
The modeler will thus only need to take care to carefully drill
out the Attack gun body.
Panzer Tracts 12-1, Flakpanzer IV, T.L. Jentz & H.L. Doyle,
Review sample purchased by the author.
This model can be purchased from