Mainspring Housing

Mainspring Housing: (Click on images for larger versions)
 The first mainspring houses on Colts where smooth and flat. Here are the variations found by manufacturer:
Figure 1/2 - Colt Model 1911 has a Smooth and flat mainspring housing. Same for Springfield, UMC, and North American.
 Figure 3/4 -Early Colt 1911A1s have checkering on the back of their arched mainspring housings, totaled 26 +/- 1 lines.
Figure 5 - Late Colt has a total of 7 ribs on the arched mainspring housing
 Figure 6A & 6B - US&S has coarse checkered and is blued.
Figure 7 -1943 Ithaca has a coarse checkering like U.S.&S.
Figure 8 -1944/1945 Ithaca has grooved 7 ribs on a arched mainspring housing
Figure 9 -1942/1943 Remington Rand has a very fine checkering with over 36 lines on an arched mainspring housing. RR used the old Singer production equipment for their early production.
Figure 10 -Late Remington Rand has 8 ribs on arched mainspring housing.
Figure 11 - Singer Production


M1911-Fig. 1
1911 to 1919
M1911-Fig. 2
1911 to 1919
Colt
1924 to 1944
Figure 3
(Click on image)
Colt
1924 to 1944
Figure 4
(Click on image)
Colt
1944/45
Figure 5
(Click on image)

US&S
1943
Figure 6A
(Click on image)
US&S
1943
Figure 6B
(Click on image)
Ithaca
1943
Figure 7
(Click on image)
Ithaca
1944 to 1945
Figure 8
(Click on image)
Remington Rand
1942 and 1943
Figure 9
(Click on image)

Remington Rand 1944/45
Figure 10
(Click on image)
 
Singer
1941
Figure 11
 (Click on image)		      

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