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Regarding the HK MR556 extractor spring / buffer:

I have spent some time reviewing the forums with respect to extractor spring / buffer issues. And usually the discussion involves D rings, O-rings, Wolff springs and color coded buffers - and with respect to actual ejection/ extraction issues.

My question however is just about replacement and 3rd party substitutes for the HK proprietary extractor spring/buffer:

1)My understanding is that, with respect to the MR556, the standard MR556 extractor spring is a 'dual' spring , supposedly much stronger than a typical spring. But when i look at mine, all I see is a simple spring with flat ends on some proprietary black buffer. So I don't really know how strong this HK proprietary spring/buffer system is. I am a little hesitant to switch to a 3rd party spring (if I ever needed to) , especially since this is a 16.5 " barrel (falls between rifle and carbine length and therefore not clear about blue versus black buffered spring strengths)

2) Also, several members have noted that this HK spring/ buffer should 'snap' into the actual extractor, or at least require some work to get the spring out. Mine just fell out - spring with buffer. There is no tight fit on the extractor, and there doesn't seem to be any real issue with just placing it right back on the extractor , making sure the buffer is in proper position. Perhaps this ease of removal is a function of the type of HK rifle, but with respect to the MR556, is there suppose to be difficulty removing it? And is this why is it always recommended to replace the extractor/buffer every time you remove the extractor from the bolt?
 

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Being that it's a carbine length gas system, the standard M4 extractor spring and insert should do fine. Crane "O" ring probably not necessary and I have left one out of my MR.

I may try one later just for ****s 'n giggles to see what happens, but so far one isn't necessary.
 

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sorry for resurrecting this thread but im searched for answers and now i need opinions. I have a HK mr556 upper and my seekins lower finally arrived with an m4 stock and buffer spring. Ive read the forums and googled it that only a HK spring and buffer should be used for reliability. Ive searched stores online and gunbroker, but no one has an HK buffer. Would using the standard M4 buffer be alright for the time being until i find an hk buffer?
 
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