do gp100 and security six have any part compatibility?

What is any parts are the same from one platform to other?

No common parts as far as I know.

Mainsprings. They are different weights but one can use one out of one in another assuming the proper weight. As an instance a 11 lb mainspring (Wolff) for a GP will work on a highly tuned Six.

Thanks for your reply.

look up the key codes for each gun, if they have same code then its the same part. i lost my center pin lock while cleaning my service six. i called ruger and was told that they don't service these guns but some parts are still the same, the worker checked and the center pin lock had the same key code. ruger sent it to me free. i was up and shooting in about 4 days,

Just curious but what are you trying to accomplish? Are you looking for a part for your security six?