![]() Also less desirable are the large size 0.170' diameter hammer and trigger pins which started about 1989-1990 up to the mid 2009, before those since the start of the SP1 in 1964 and after mid 2009 the hammer and trigger pins are the small mil-spec size of 0.154', to me the small fire control group pins are more desirable because some aftermarket match triggers cost less than with the large pin sizes, also all other non Colt brands uses the standard small pins. There are some pre ban Colt models AR that are not desirable in my own opinion like the ones with protruding sear blocks on the lower receivers, they started doing that around 1990 up to about 1994, also most of those have the half moon bolt carrier where the lower rear of the carriers was all machined off. 13, 2004 we could just call those AR no ban. ![]() ![]() 12, 2004 so we shall call Colt AR that were made during that time are post ban, all that are made before the start of the ban up to 1964 are pre ban, I posted a link below of serial number reference of most Colt models pre ban and post ban (but not all - the list is not complete).
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