1. Introduction (frg. I)
I. The Rifle, ·303 in., No.4, Mk. l(T) is a
specially selected No.4, Mk. 1 rifle on which
are incorporated certain modifications to
convert it for sniping. Particulars of these
are given below.
2. The selection of snipers' rifles is done
during the testing of rifles after manufacture,
when the weapons are being fired on testing
ranges. The performance of individual rifles
varies appreciably, and is finally assessed
when a proving group is fired from each
weapon under carefully standardised con-
ditions. As many rifles. as are required for
sniping are then selected from among those
which have given the closest grouping, and
are sent for conversion.
3. With 'each sniper's rifle is issued a
Telescope, sighting, No. 32, Mk. 3, which is
packed in a pressed steel box having a leather
shoulder strap (jig. 2). The rifle and its boxed
sighting telescope are packed in a wooden
chest, S.A., No. 15, Mk. 1 (jig. 3).
DESCRIPTION
Rifle
4. The rifle is basically a No.4, Mk. 1
weapon, with the additions and alterations
. detailed in th~ following paragraphs.
5. On the left-hand side of the rifle body, a
drilled and threaded lug is secured by three
screws immediately to the rear of the. gas
escape hole, and a drilled pad is fitted over a
threaded hole between the charger guide and
the hinge point for the backsight (jig. 4).
These locate the mounting' bracket of the
sighting telescope, and accept the front and
rear clamping screws respectively.
6. A wooden cheek pad is secured by two
wood screws on the upper side of the butt
stock immediately to the rear of the hand
(jig. 1). This brings the firer's eye level with
the line of sight through the telescope, and
assists him in keeping the correct position
of the eye backwards or forwards to suit the
eye clearance, or eye relief, of the telescope.
7. To allow the telescope to be accommo-
dated on the rifle with the line of sight at a
convenient height above the centre-line of
the bore, the battle aperture sight is not
'present on the tangent backsight.
8. There is an additiona:l sling swivel (Type
T) which is secured on a screw at the forward
end of the trigger guard, and the rifle is fitted
with a leather sling which is sufficiently long
to enable the firer, if it is preferable, to use
the sling with its forward end on the lower
band sling swivel and its rear end on the trigger
guard sling swivel. The sling then becomes
of the competition type, the point of attach-
ment of the rear end of the sling to the rifle
being nearest the firer's forward hand (jig. sq.
Sight
9. The telescope, sighting, No. 32, Mk. 3
(jig. 6) is a terrestrial telescope giving a
magnification of x3. The object glass is a
cemented doublet at the plane of focus of
which is positioned a sighting graticule con-
sisting of a cross wire and a slender metal
pointer (jig. 7). The image erecting system
consists Qftwo cemented doublets, while the
eyepiece is a symmetrical pair of cemented
doublets (jig. 8).
10. The eye clearance, or eye relief, of the
telescope is 2·5 in. This means that the
Ramsden circle occurs 2·5 in. to the rear of
the eyepiece, and the firer must plaee his
eye in this position in order to see the full
aiming picture and magnified field.
,Fig. I. Rifle, ·303 ln., No.4, Mk. I(T) (Sniper's)
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2. Th,s leaf issued with A.L. No. 32, September, 1952 A.P.I64IP, Vol. I, Sect. I, Chap. 13
II. Light transmission of a high order is
obtained through the fact that all air-glass
surfaces are bloomed, including the exterior
surfaces of the object glass and the eyepiece.
12. The telescope is waterproofed; that is,
it is tested under compressed air and sealed
in manufacture against the admission of the
outer atmosphere, This prevents the conden-
Fig. 2. Telescope, sighting, No. 32, Mk. 3
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3. Fig. 3. Packing of rifle and sight
sation of moisture on the internal air-glass
surfaces of the lenses, but does not meanthat
the sight can be exposed to rain or heavy
mist without deterioration.
Leading particulars
13. The leading particulars of the sight are
as follows:-
Magnification
Field of view
Working diameter
of objective
Entrance pupil
diameter
Exit pupil diameter
Eye clearance
Collimation
x3
8·5 deg,
0·75 in.
0·75 in.
0·25 in.
2·5 in.
Adjustedto
individual
rifle
Moving
wire, non-
illuminated
2·57 in.
Graticule
Focal length of O.G.
Identif!cati on
14. The main nomenclature of
the telescope is engraved on the
upper side of the telescope tube.
Below this, appear the manu-
facturing data, thus:-
OS.2039A
(Optical
Store part
number)
CTS
(Manu-
turer's
monogram or
initials)
No. 19459
(Manu-
turing
serial
number)
"
1S. Each sight is collimated to its companion
rifle, 'and must not be used with any other
weapon. For this reason, the serial number
of the rifle is stamped on the left-hand side
of the sight mounting bracket.
Fig. 4. Attachment points for sight
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4. This leof issued with A.t. No. 32, September, 1952 A.P.I64IP, Vol. I, Sect. I, Chop. 13
Fig. S. Adjustments t9 sling
16. To enable the clamping pieces to remain
paired with their cradle portions of the
mounting, each is stamped with its identity,
and the same marking appears-on the mating
cradle piece, on the right-hand side. This
marking usually consists of a three-digit
number.
lens surfaces are bloomed. If, for any reason
the blooming is removed, the letter B is
erased.
18. Also on the sight tube is the letter W
in red oil paint, t in. high. This is put on the
sight at the successfulconclusionof its water-
proofing test. If any sight fails to pass this
test, the letter W does not appear. If the
sight is satisfactory in all other respects, it
17. The letter B appears on the sight tube
in blue oil paint, i in. high, to denote that the
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5. Fig. 6. Components of sight
may be issued for use in temperate climates.
Waterproofed sights may be used in tropical
climates without the risk of condensation on
the internal air-glass surfaces of the lenses.
numbered intervals of 100 yards and un-
numbered intermediate markings of 50 yards.
20. The deflection drum, which is on the
left-hand side of the graticule housing, is
graduated to left and right of zero up to 16,
in numbered intervals of 4 with un-numbered
intermediate markings representing 2. These
figures denote minutes of angle of deflection,
left or right.
Range and deflection adjustments
19. The range setting required is obtained
by rotation of the range drum situated on the
upper side of the graticule housing. The drum
is graduated from zero to 1,000 yards with
_. -.......___
POINTER '""'-,
PLATINOlD SILVER WIRE
·--.........~OOb DIA. I[z-, .~~
. ,~'". ,gg
/
.~~SSWIRE
PLATINOID SILVER.WIRE
r 0001 DIA. .>:
I
. - J~',
-If .....x. /
CONE·ENDED P,OINTER. i 'ANG~E OF CON'E-(l,OOA""o,, ,/
l --- .....-/ )' DIMENSIONS
, __[' ARE IN INCHES
"" ., /
"---- . '
A. CROSSWIRE DETAIL B. PICTURE PRESENTEDTO FIRER
Fig. 7. Sight graticule
RESTRICTED
....

6. · • I
.;.
m0
GO
2
F.
-- .
rJ-~ .;.
__. .--' _. .._Q. ~- -
.n
X0 ~
..-!-- ~ -
~
:I:.,J
Oa-
I I
Oa-
Oa- DIMENSIONS ARE IN INCHES
- ":'0
I
11·013
This leaf issued with A.L. No. 32, September, 1952
I 0,," I
1·45
AP.14bl P, Vol. I, Sect. I, Chop. 13
CARE AND CLEANING
Fig. 8. Optical system
Rifle
21. The screws securing the sight mounting
lug and pad on the left-hand side of the body
are locked by the centre-punching of metal
into one end of the screwdriver slot, and should
not work loose. If they do, however, they
should be tightened.
22. The rifle should be cleaned and lubri-
cated as detailed in Vol. 2, Sect. 1, Chap. 4.
Sight
Mounting the sight
23. The correct way to mount the sight is
to screw up both clamping screws together,
and give the final tightening on the rear
screw.
Weather protection
24. To protect the exterior surfaces of the
object glass and the eye-piece from deteriora-
tion through the prolonged action of the
atmosphere, the leather protector issued with
the sight is to be kept in position at all times,
except when the telescope is actually in use
for sighting or observation.
Transportati on
25. Except when the rifle is required for im-
mediate use, it must be earned with the sight
dismounted and firmly clamped in its box.
Lens cleaning
26. Issued with each telescope are two
pieces of linen approximately six inches
square. These are to be carefully used to
clean the exterior surfaces of the object glass
and the eyepiece. The linen must be abso-
lutely dry. and free from dust or grit; it must
be used sparingly, and only the minimum of
gentle rubbing must be given to remove
smudges or condensation from the lenses.
Tightening of screws
27. There are eight screws securing the
upper portions of the clamping cradles, four
in each. These are locked by the centre-
punching of metal into one end of each
screwdriver slot; if any of the screws become
loose they should be tightened but not other-
wise disturbed. .
28. No other screws on the telescope are to
be touched, otherwise the optical system may
be put out of focus, necessitating a lengthy
process of correction on an optical bench.
Moreover, the waterproofed condition of the
telescope may by broken down by the
admission of moist atmosphere into the
telescope tube; condensation will then form
on the interior surfaces of the lenses, and the
sight rendered unserviceable ..
P21179 50224/G6087 1O/~2 4000 C & P Gp, 1
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