I'm sorry no one has responded to this question, or the question about Sako parts. .043 is a pretty good place to be on headspace. I have a pair of much modified Sako 94's & since the headspace can be easily adjusted on the rifles, I lean towards tighter, rather than looser. The Sako's were very popular in benchrest competition before the custom actions became readily available. As to spare parts, Sako is now owned by Beretta, so work thru their Website as well as Brownell's. Clearly used Sako's are around & I expect most owners are hoarding what spare parts they have. I had a lot of fun with my Sako's & maybe I will again if the ammo company's will do a better...hell, I won't get into that !!