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Sig 516 Upper - buffer/spring question

1482 Views 3 Replies 3 Participants Last post by  rockelino
Hi everyone,

I'm buying a 10" Sig 516 Upper (barrel, BCG, Charging handle, handgrips, etc.) from a private seller. It does not come with the "Sig heavy buffer and spring." I already have an AR-15 Pistol Lower (complete with the Tailhook Mod 2 brace). Do I need to buy the Sig heavy buffer and spring and replace the existing ones in my lower?


This will be my first ever Sig weapon.
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The one Sig sent me is marked with an H, if your existing one has an H I would assume it would work OK.
Use an H buffer. It doesn’t need to be from sig. only time I would use a different buffer on a 516 is if you run it full auto. For FA I use a tungsten powdered buffer H2. Many don’t know this but 516 factory full autos use tungsten powdered buffers.
Once I buy the upper, how do I register it, since SIG requires a serial number upon registration?
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