User's Manual

AT308 - USER MANUAL
32
10. QUICKLOC BARREL REMOVAL AND REPLACEMENT
The AT308 Rifle features the Accuracy International QuickLoc® barrel system as standard.
WARNING
DO NOT REMOVE THE QUICKLOC BARREL SCREW.
DO NOT TIGHTEN THE QUICKLOC BARREL SCREW WITH THE BARREL
REMOVED.
To Remove the barrel:
 Ensure weapon is safe to handle and unloaded.
 Loosen the QuickLoc
®
barrel screw 2-3 turns - do not unscrew any further.
 The barrel can now be unscrewed in a anti-clockwise direction. If the barrel will not
unscrew by hand, a 3/4” or 19mm AF spanner can be used on the two flats machined into
the barrel near the muzzle.
To Refit the barrel:
 Ensure that the threads and mating surfaces of the barrel and action are clean,
undamaged and free of debris.
 Screw the barrel into the action until the action mating face is securely in contact with the
barrel flange - no gap should be visible.
 Tighten the QuickLoc® barrel screw to 5.5Nm (49in/lbs).
 Verify that the barrel is tight by trying to unscrew the barrel by hand, using no more than
reasonable force.
 Headspace should always be checked after refitting barrels, see section 1.7.
WARNING - IF THE BARREL CAN BE ROTATED BY HAND AFTER TIGHTENING
THE CLAMPING SCREW, RETIGHTEN THE BARREL AND BARREL CLAMPING
SCREW AS DESCRIBED ABOVE. IF THIS DOES NOT PROPERLY SECURE THE
BARREL, THE RIFLE MUST BE INSPECTED BY AN ACCURACY
INTERNATIONAL QUALIFIED GUNSMITH OR ARMOURER.
ENSURE THE LOCK RING IS IN PLACE AND IS SECURE. THIS CAN BE
INSPECTED THROUGH THE EJECTION PORT.
QUICKLOC BARREL SCREW
(4mm AF HEX KEY)
BARREL FLANGE
ACTION MATING FACE
N7
30.0
PRELIMINARY
NOT CHECKED
NOT RELEASED
21
1005020
1
1
3
TITLE
DIM'N IN
ORIGINAL
(UNLESS
(FOLDING)
4
(6) UNLESS OTHERWISE STATED, ALL TAPPED HOLE THREAD FORMS ARE
(2) A RADIUS OR CHAMFER OF 0.2 (MAX) IS PERMITTED IN THE
STATED)
ESTIMATED
2:1
g
mm
AT, GENERAL ASSY
OF
AI-26677
5 6 7
INTERNATIONAL LIMITED. The recipient acknowledges that the copyright
NATO STOCK No:
FINISH
SPECIFICATION
DATE:
SPECIFICATION
BY:
CH'NGE
ISSUE
DRAWN/DATE
This drawing contains confidential information belonging to ACCURACY
TO BS 3643-6H. WHERE A THREAD DEPTH IS QUOTED, IT IS MINIMUM
ARE INSPECTION DIMENSIONS
FULL THREAD DEPTH.
DIMENSIONS DISPLAYED THUS
for the recipient to copy or make use of the information contained in
MODIFICATION. (WHERE NUMBER IN BOX IS APPLICABLE CHANGE)
(3) ALL DIMENSIONS ARE FINISHED DIMENSIONS: i.e. AFTER
CHECKED
ACCURACY INTERNATIONAL
thisdrawing. The recipient shall maintain the confidentiality of the drawing.
CERT'D
INTERNATIONAL LTD. No license is given by ACCURACY INTERNATIONAL LTD
(5) REFERENCES TO STANDARDS & SPECS. IMPLY LATEST ISSUE.
CORNERS OF BLIND HOLES, RECESSES & STEPS.
(4) DRAWING FEATURES MARKED THUS 3 INDICATE LATEST ISSUE
APPLICATION OF SURFACE FINISH
3rd Angle
15'
0
DRAWING NUMBER
A
Projection
SH'T
UNIT ± 0.5
.0 ± 0.25
.00 ± 0.1
ANG ±0
OTHERWISE
MASS
& design right in this drawing belong to & remains vested in ACCURACY
CHANGE:
RESPONSIBLE AUTHORITY AND
C
LAST
SCALE
TOLS:
STATED)
MATERIAL (AND SIZE)
K
J
H
G
F
E
D
C
B
A
15141312111098
DRAWING PROCEDURE TO DEF. STAN. 05-10 AND/OR BS 8888.
(1) ALL BURRS & SHARP EDGES TO BE REMOVED.
SURFACE ROUGHNESS
(UNLESS
OTHERWISE
0