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This is for my Historic Arms semi auto Bren. Right now it has a single Mk2 outer spring and I was thinking of going to the double spring for a bit more recoil protection.

Is the Mk1 return spring the same as the outer Mk2 return spring and the only difference is they added a smaller second inner spring on the Mk2?

I was assembling my Mk1 buttstock and a dual Mk2...