The J-spring sits in the center groove of the hammer pin. The J-spring keeps the hammer pin from walking out during the cycling of the hammer. If the hammer pin hole in the lower receiver is too large or oval the pin will walk.
With quality lower parts and a quality in spec lower, there is no need for anti-walk pins other than aesthetics.
"Perfect Practice Makes Perfect"
"There are 550 million firearms on this planet. That's one firearm for every 12 people. The question is... How do we arm the other 11?" Lord of War.
"I predict future happiness for Americans if they can prevent the government from wasting the labors of the people under the pretense of taking care of them." Thomas Jefferson
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