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Chrome Firing Pin

1K views 6 replies 5 participants last post by  nambu 
#1 ·
I have been searching for gi parts and see some people have chrome pins for sale but the chrome ones i see havent said new there are new ones but they are not chrome (tool steel?) I really dont know the need for chrome can you people shed some light on this thanks I just dont want to get something I may not need .I dont need fancy just reliable. GITEN
 
#2 ·
One of the pros will probably answer you shortly , but, in the meantime.... I believe the first firing pins were non-chrome, like the M1 Garand f.p.'s. Then an improvement was developed and the firing pin tip was chromeplated. The final development was the all chromeplated firing pin. Undoubtedly these changes had to do with increased reliability or less service/repair needs. Hope that helps.
 
#3 ·
Chromed firing pins

The military chromed the firing pins were developed to eliminate corrosion problems in Nam. They do work well, however, shome chromed pin tend to stick in some bolts. It's not a serious problem, because those that stick, usually won't even fit in the bolt to start with. It's said that bolts with part number ending in 5 are for non-chromed bolts and those ending in 6 were designed for the chromed pin. I'm not so sure of this. I have found early bolts that would take the chromed firing pin.
 
#4 ·
Ted Brown said:
It's said that bolts with part number ending in 5 are for non-chromed bolts and those ending in 6 were designed for the chromed pin. I'm not so sure of this.
I'm pretty sure bolts ending with 6 had bolt roller pre-installed,where bolts ending with 5 came without the roller.

RED DOT
 
#5 ·
Red dot is correct. The two different part number indicate a stripped bolt versus a bolt with roller assembled.

Actually the chroming was to prevent firing pin tip breakage. SA in the late 1950's had a lot of problems producing firing pins with tips that would not break. In 1962 SA manufactured the chromed tip firing pin for the M14, to eleviate the problem. Shortly afterwards this change was used for some existing Garand firing pins. In 1965 it was found easier and cheaper to chrome the entire pin. This change was given a new part number. The full chrome was never applied to the Garand, just the M14.
 
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