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Old April 20, 2009, 03:11 PM   #15
dfloomis
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Join Date: January 5, 2007
Posts: 16
Colt used to use different sized pins for upper/lower assembly, but do not any longer. The only real difference you may notice is if you wanted to exchange the trigger. Colt uses a larger trigger pin, but many aftermarket triggers offer the larger pin size.
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