So I built a 7.5 " off a PSA marauder upper and spikes lower, I bought the complete KAK blade kit for it and am now considering getting a longer pistol Upper for it, say 10.5" or higher but still pistol upper length.
My question is, will I need a new spring and buffer if I go up in length..and if so what spring and what buffer?
So far the 7.5" upper is working perfectly with the KAK kit with zero failures of any kind!
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