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coma13
03-04-2013, 2:40 PM
I'm putting together a lower that I plan to share between a 5.45 and 5.56 upper. Can I get away with installing the higher power hammer spring that is recommended for use with the 5.45 upper and leaving it in when I'm running the 5.56 upper?

ar15barrels
03-04-2013, 2:57 PM
Yes.