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word of advice... when installing the front pivot pin put the lower reciever in a 1 gallon zip lock bag so when the detent and spring goes flying you wont lose it. i have found that if i lay my lower on its side i will install the spring and detent for the front pin and use the front pin to push the detent in while pushing it thru the receiver. to me, its much easier to do than the razor blade method. i can usually get it first try doing it 'my' way.