What he said! You will crack the lower receiver shooting the .380 barrel without a good buffer. Try member Slpeen. He makes his own version and have heard nothing but good reports.
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HK4 .380 Barrel
I recently inherited an HK4 from my dad. Came with three of the four barrels. Missing the .380 barrel with spring. Wondering if anybody had any ideas where I might be able to purchase this missing barrel. Thank you.
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