So I don't have the old barrel or a KAC SR25 barrel extension, My newly found out understanding is you need a KAC SR25 extension, not a standard one...
Can anyone shoot me some advice on what the next step is?
Nevermind, if anyone else has issues fitting a DPMS style extension receiver into a KAC upper just heat the upper up a little bit with the heat gun and it'll slide right in when it cools it a lock it in place
