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Discussion Starter · #1 ·
I am a new owner of a HK MR556A1 and recently installed a new backplate sling attachment. In doing so, I lost the pressure spring and locking pin (Owners Manual parts: 83.) Stop pin for locking pin Part #233115
84.) Pressure spring Part #233116. What is the purpose of these two parts and should I replace them?
 

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The spring and pin are to hold pressure against the rear takedown pin, if I am understanding you correctly. Yes, you should replace them. Any standard milspec AR parts will work if you can't get the HK. When you install them, use a broad flat knife to hold them in place as you turn the buffer tube into position.
 

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Discussion Starter · #3 ·
NzFly, Thanks for the advice, my replacement parts are already on the way from HK Customer Service!
 
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