Pistol Upper Question's

[UNIT 6639]

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!

[wildcard600]

Assuming you are using a standard carbine spring, there shouldn't be any need to change that. My 10.5 PSA pistol uses a H3 buffer since it's a bit over gassed, but my BCM 11.5 has an H2 buffer.

[UNIT 6639]

Thank you sir for replying, I'm looking at getting a PSA 10.5", they were out of stock Black Friday and I settled with the 7.5 marauder upper.