I have one Colt 601 retro grip that I bought from Jack Martinez back in the day. It is in VG condition with some green paint left on the edges. Very nice Brownish look of the early Armalite rifles.
I think Jack said he got the furniture from a Nevada US Navy surplus sale in the 1980's.
Price is $30 + $5 shipping. If you want a copy of Jack's old parts list with some nice AR parts, add $5.
Price is same as I paid back in the early 1990's. No haggling please.