TheBigYin
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Just a quickie - are the ETRS and ETRSi backs interchangeable. From what I can make out the ETRS just have a single slider for releasing the winding insert rather than 2 on the ETRSi versions, and the Grey darkslide with the interlock that prevents (okay, makes it a conscious decision!) removal of the darkslide while the back is detached. Question is, would the older ETRS backs still work on the ETRSi?