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Posted: 8/15/2026 6:02:29 PM EDT
Does anyone know where to find one of these  in stock?Thanks |
No idea if it's a good deal / legit but that's what credit cards are for  https://www.rksusa.net/HK416-A5-EXTENDED-CASTLE-NUT-p/236733.htm |
"That pistol just kept saying, let go of my ears, you don't know what you're doing." - thehellbringer
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HK Parts Pro is legit, though it's out of stock at the moment. https://hkpartspro.com/extended-castle-nut I also check the HK USA Web store, but I do not see it listed there; you could call customer service and maybe they will sell you one. |
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Originally Posted By cccpNyC: No idea if it's a good deal / legit but that's what credit cards are for https://www.rksusa.net/HK416-A5-EXTENDED-CASTLE-NUT-p/236733.htm Steer far, far away from RKUSA. |
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Originally Posted By wildearp: Does this balance out a front-heavy rifle or something? Did I miss the memo?  Supposed to reinforce one of the weakest parts of the M4. Smack the buffer tube right at the threads really hard while the receiver and stock are pinned, and you can snap the tube off. Not exactly a common occurrence. My thing is, their extended castle nut requires their buffer tube, and it's a marginal improvement at best, since the added section isn't threaded, as it has to fit over the tube itself during installation. I figure if breaking off the buffer tube is that big a deal, the UBR is always an option. |
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Originally Posted By rb889:Supposed to reinforce one of the weakest parts of the M4. Smack the buffer tube right at the threads really hard while the receiver and stock are pinned, and you can snap the tube off. |
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