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Rey,
I'm looking at my MP parts manual (from HK) and it doesn't show any buffer with the buttcap. The only thing illustrated with the buttcap is the swivel with bushing (205935 @ $8.75) and 4mm circlip (971748 @ .80).
The complete buttcap for the MK5K is part #206409 @ $43.00.
It's proabably best to call H&K yourself and explain it to them. They're in the best position to help you.
Gary
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