I've just accuired a fairly clean 4516-1, it's my 3rd, third gen S&W (908s & 910s), it came with one mag - yellow follwer & marked "this magazine must have a yellow follower", and does not appear to have gone back to the factory for any modifications, still has the single guide rod spring & no bushing. Have not shot it yet as I have to wait 10 days just to have it in my hands, but my question is do I have to find used mags with the yellow follower or are the later mags with the black follower ok ??? I like to have at least 3 mags for every gun so all replys will be appreciated, Thank You