SIG SG 550 series of rifles goes for being among the absolute
finest military rifles ever built.
working principle is based on the AK-47 with a gas piston and
rotary bolt. Unlike the AK series of rifles, the receiver is
made in two parts similar to the M-16. This eliminates the
dust-cover and makes it possible to mount the rear sight at
the rear end of the upper receiver and thereby get a longer
sight radius than is possible with the AK system. Of course,
the Israeli Galil which also is based on the AK has a rear
sight mounted on the dustcover, which in my opinion is a less
satisfactory way to do it. This cover needs to be removed
every time the Galil has to be cleaned, and over time I don't
think it will be able to hold zero. The trigger mechanism of
the SG 550 series is not based on that of the AK series, and
is the smoothest "out of the box" trigger I have ever
encountered on a military rifle. The two receiver parts are
made of stampings, with the barrel mounting block/locking
piece and the butt stock hinge part made of machined steel. The
butt stock of the later production model has been modified with
a breaking point so that the stock will break instead of
warping the receiver should the rifle be subject to an extreme
(over)load. This way the rifle will still be operable although
it no longer has a butt stock.
In the above pictures,
the difference between the new (left) and old (right) style
stocks is clearly visible.
has a flip-up front sight post with a luminous dot that
corresponds with two similar dots on the open notch aperture
of the rear sight drum for night use. The rear sight drum has
four apertures numbered from 1 to 4 indicating distance in
hundreds of meters.
features a winter trigger guard that pivots to either
the left or right side so that the trigger is accessible with
heavy arctic mittens and magazines that can be clipped
together. This system was later used by Heckler & Koch on the
factory offers various military models ranging from the short
SG 552 to the heavy barreled SG 550 sniper. The factory also
offer a wide variety of accessories including scopes,
blank firing adapters, hard
cases, a 40 mm grenade launcher similar to
the M 203 and also a complete line of semiautomatic sporter
models for the civilian market, the latest addition is four
versions with the receiver painted in either black, blue, red
or clear coating.
SIG SG 550/II fitted with a
built BR Reflex suppressor.
This particular rifle is
an early version which has the old style butt stock and lower receiver.
SIG SG 550-2
with butt folded
||528 mm (20.78")
grooves rh twist 1:178mm (1:7")
incl. empty magazine
empty 20 rd. magazine
empty 30 rd. magazine
g (3.87 oz)
loaded 20 rd. magazine
loaded 30 rd. magazine