SIG SAUER BLASER Tac2 - Manual (Page 21)

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There are 4 caliber groups available (see
table chapter 12). When changing the
barrel to a different caliber group, you
will also have to change the bolt head to
suit the caliber group of the barrel you
have chosen to use. The table (chapter
12) shows the correct components to be
used together. In addition, bolt heads
and barrels are stamped with markings
which identify the caliber group (fig. 13).
Take a final check that these markings
match after the rifle is assembled.
If you change barrels within the same
caliber group you do not have to change
the bolt head.
Caliber group markings:
Mini Marking MI
Standard Marking ST
Magnum Marking MA
338 Lapua Marking LA
NOTE:
Bolt heads for left-hand bolts are
stamped “L“ below the caliber gro u p
m a r k i n g .
13. Changing the barrel
Make sure you also use the correct mag-
azine to match the caliber of the barrel.
The caliber marking can be
found on the side of the magazine.
WARNING:
Always make sure there are no cart-
ridges in the chamber or magazine.
13.1 Changing the barrel:
• Unload the rifle (see chapter 10).
• Remove the magazine.
• Remove the bolt assembly
(see chapter 11).
• Fully undo both barrel attachment
screws with the 4 mm allen key, these
are captive so cannot be lost.
• Lift the barrel out of the receiver.
• Place the new barrel in the bed of the
receiver.
• Tighten both barrel attachment
screws hand-tight with the allen key.
• Insert a magazine matching the caliber
of the barrel into the magazine hous-
ing.
• Check that the marking stamped on
the bolt head (MI, ST, MA, fig. 13)
matches the caliber group of the barre l .
• If you have to change the bolt head in
the bolt assembly (see chapter 14).
NOTE:
Always keep the barrel bedding clean.
Excessive oil or grease between the barrel
and receiver will impair the accuracy of
the rifle.
fig. 13
ST ST
NOTE: .338 Lapua is a stand-alone caliber – it is not interchangable with other
caliber groups.
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