I just threaded and changed the gas block and FSP and come to realize that my SA 85M has the shorter gas tube. Is there a bayo that will fit??? I am fairly new on working on Ak's so go easy on me lol.I should have checked before I switched gas blocks,but oh well its on there now.just wondering if there is a bayo that can fit.

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No there isn't that I know of. As you found out you have the shorter AMD gas system.  The AMD didn't use a bayonet.

In this case you really should have left it original, but it doesn't hurt anything to have a useless bayonetlug. But, since you have the short gas tube, you can pick up an AMD65 'naked' gas tube and vented steel forearm with pistol grip. FEG actually imported that very rifle as an 'SA2000M'. They came with single-stack magazine well that was easily converted by the importer to double stack. Of course, these were made from AMD65 kits and had the original 12" barrel which is why it needs the welded-on extension/brake.

Thanks for info,nice rifle!