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Page Title:
Table 2-2. M3 BORESCOPE ASSEMBLY AND BORE MAGNIFICATION TABLE |
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 ARMY
TM 9-6650-235-13&P
MARINE CORPS
TM-08552A-13&P
Table 2-2. M3 BORESCOPE ASSEMBLY AND BORE MAGNIFICATION TABLE
Approximate
Borescope
Length of
Weapon being
length of
Supports
extension tubes
assembled M3
Magnification
inspection
gun
required
required
Borescope
60-mm mortar
2 ft 4 in.
2
None
7 ft (2.13 m)
2.2
series
(0.71 m)
75-mm rifle
4 to 6 ft
2
None
7 ft (2.13 m)
2.0
series
(1.22 to 1.83 m)
76-mm gun
13 to 16 ft
series
(3.96 to 4.88 m)
3
I, II
21 ft (6.40 m)
2.0
81-mm mortar
4 ft (1.22 m)
2
None
7 ft (2.13 m)
1.9
series
90-mm gun
16 ft (4.88 m)
3
I, II
21 ft (6.40 m)
1.8
series
90-mm recoil-
4 ft 5 in.
2
None
7 ft (2.13 m)
1.8
less rifle
(1.37 m)
105-mm gun
17 ft (5.18 m)
3
I, II
21 ft (6.40 m)
1.8
series
105-mm howitzer
8 ft (2.44 m)
2
I
14 ft (4.27 m)
1.6
series
106-mm recoil-
11 ft 2 in.
2
I
14 ft (4.27 m)
1.6
less rifle
(3.42 m)
4.2-in. mortar
5 ft (1.52 m)
2
None
7 ft (2.13 m)
1.6
series
120-mm gun
26 ft (7.92 m)
4
I, II, lIl
28 ft (8.53 m)
1.5
series
155-mm gun
24 ft (7.32 m)
4
I, II, Ill
28 ft (8.53 m)
1.5
series
155-n:m howitzer
12 ft (3.66 m)
2
I
14 ft (4.27 m)
1.2
series
8-in. howitzer
17 ft (5.18 m)
3
I, II
21 ft (6.40 m)
0.9
series
2-16
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