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Discussion Starter #1 (Edited)
So I'm taking my HK MR556A1 to a free state and getting rid of the stupid state magazine device lock and I'm going to put the factory free state one back in. Unfortunately my rifle didn't come with the original magazine release parts so I'll have to order them.

Only thing is I know I'll need the factory Magazine Release Button and Magazine Catch Spring and I should be set correct?

But browsing HK Parts Net I came across a part I've never seen before a Magazine Catch Retainer Ring Pin? What the hell is it and do I need it?

Any help would be appreciated?
 

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I believe that's for the mr762, it uses a different type button than the 556.


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