Re: Sportsman Model 999 by H&R Inc.
your model 999 was manufactured in 1968. according to H&R parts list and Numrich arms parts listing the plastic and steel heads for the mainspring guide rod are not interchanable. because of the type of plastic use by H&R during this time the breakage of this part is common. i believe numrich has a new supply of the hammer spring and guide that they sell as a assempled unit and it is very easy to change. a H&R collector friend of mine (who has a large number of 1960's H&Rs usually buys them by the dozen.