Hi Scipio... Hmmm.. [:\] I have a SAR-1 too. I can't think of the name of the crap that they pack them in to ship them here (cosmoline?)... But it's like some kind of Siberian axle grease or something. Mine was so caked up with that stuff that I had to give it to a gunsmith, who kept it in his flowing solvent tank for about 5 days, before the crap finally came off!
Anyway, what I think may be happening in your case is that there is still some of that stuff left on the internal parts. Your cleaning and lubing probably loosens it a bit and it globs up around the parts.
If it continues, I would recommend doing what I did... take the metal parts to a gunsmith and let him/her soak it for a couple of days in their solvent tanks. Then just take it out, lube it again and it should go away.
BTW... I have about 400 rounds thru my SAR-1 and have yet to clean it (except for the above solvent tank episode). LOL!!! I probably will soon, however, just out of guilt.
Take care,
ARnSC