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I'm thinking weak hammer spring or firing pin. Any other ideas?
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Without being able to see the rifle first hand, or knowing the manufacturer(s) of each part, It could be the gas tube, or like you stated, the firing pin. Is the hammer spring seated correctly? Brownell's sells a pigtail tube that may correct the deficiency. Here is the site with a description of what it does.
http://www.brownells.com/aspx/NS/sto...GTAIL+GAS+TUBE Hope it provides an option for you.