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Would like to improve the DA pull and would like suggestions? Other than a lighter hammer return spring is there anything else to consider?


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The DA pull is designed that way as a safety. If I remember the A1 uses the DAK (red) mainspring. I'd try the normal SIG mainspring and see if that helps.
 

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Depending on your skills, you could polish the trigger bar where it makes contact with the hammer, and grease the contact points. I wouldn't go lighter than a 19# mainspring, for reliability on a carry or defensive weapon. From what I understand, they have used a heavier than normal mainspring, in those for some reason, as some other members have reported.
 

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Two words: Robert Burke. He did my 225 A-1 and the trigger is much better all around.
 
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The newer ones are shipping with lighter springs. The standard M11 (short) hammer spring does a nice job. That was the only thing I did to mine other than shooting the hell out of it. I've replaced the recoil spring once already.
 

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Send it to SIG for the AEP or Robert Burke or Bruce Gray. Each of them changes the mainspring to the lighter normal one and does a nice action enhancement job.
 

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Replace that red mainspring and report back. I'm guessing that is all you need to do. Why look for any other solution when a $3 spring is all you need?
 
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