Quoted:
So I am going to buy a replacement buffer tube, since the KAK seems pretty heavy (..?) I was hoping for a recommendation of a light tube that works with the sb-15
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Well, the
KAK Super SIG says it's 6.2oz, the
Phase 5 Pistol works out to 6.94oz (weight might include foam pad though, unclear), and the
PWS EBT Pistol claims 5.4oz (again unclear if includes foam pad).
I like the PWS EBT Pistol for its QD sling attachments, extended lip, and castle-nut-free design - but note that the stub on the SB15 hits the PWS as-is. This adds ~1/2" to the length - which some folks might like, and others might choose to X-acto off the SB15 stub...
Of these, the PWS looks lightest - but I think it's also the priciest at close to $130
I didn't weigh mine before installing, but I'm happy with it so far.
HTH,
Richard