i have the nylon 66 that was passed down to me and it is my understanding that these were proto-type guns of the 70's and that remington has a lifetime warranty on everypart of the rifle,so if messing w/ the clip does not help maybe you coul try contacting remington.
If ye love wealth better than liberty, the tranquillity of servitude than the animating contest of freedom, go from us in peace. We ask not your counsels or arms. Crouch down and lick the hands which feed you. May your chains sit lightly upon you, and may posterity forget that ye were our countrymen!