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JT-AR-MG42 · July 17, 2020, 08:16 PM

IIRC, the 181 series was the start of the 'button' hold open.

Don't think Ruger would have waited until January of '78 to start making the 181 series, so it stands to reason
that yours was made sometime in '77.
I have not seen a serial table that shows serial no. for the last of the 180 series either, i.e. how high the numbers went.

JT

July 17, 2020, 08:16 PM	#2
JT-AR-MG42 Senior Member Join Date: December 27, 2008 Posts: 555	IIRC, the 181 series was the start of the 'button' hold open. Don't think Ruger would have waited until January of '78 to start making the 181 series, so it stands to reason that yours was made sometime in '77. I have not seen a serial table that shows serial no. for the last of the 180 series either, i.e. how high the numbers went. JT __________________ I hunt not to kill, but rather to have not played golf...