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Old February 25, 2013, 09:56 PM   #3
AR15barrels
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Join Date: August 23, 2006
Location: Los Angeles, CA
Posts: 53
There are many causes for this problem.
The pins themselves are rarely the cause though.
First, is the hammer spring installed correctly?
If the hammer spring is installed backwards on the hammer, the legs of the hammer spring will not lay alongside the trigger correctly into the trigger pin groove.

Next, is the trigger keeping the hammer spring from getting into the trigger pin groove?
Some of the hammer castings are sloppy and need a little correction with a grinding wheel or cutoff wheel.
The hammer spring leg should lay freely into the trigger pin groove throughout the full trigger travel.
If you hold the hammer back and look down into the fire control pocket while finger ufcking the trigger, you should not see the hammer spring leg moving up and down as the trigger is articulated through it's full range of travel.
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