New gas block from KAC.
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Thanks, sorry I got mixed up with a thread I read right before posting that; it was similar, but the OP said he was building off an AX lower.
The only reason why I'm keeping my noveske lower is because I already have it and don't want to spend the time to get another lower (however I might get in on the Battle Arms lower). Other than that I don't want to deal with Noveske ever again, had a bad experience with them.
Two points.
First. The 14.5" carbine upper is a medium contour dimpled barrel. It also has a different gas port size than a 16" SR-15. (See KAC industry thread early 2013 jack L made some references to it). However, apparently a lot of folks have chopped the 16" upper without opening the gas port and no apparent problems. I love the 14.5" carbine upper.
Second. As has been pointed out "better" barrel would need to be defined. But you are going to be hard pressed. You won't get KAC intermediate gas system or the E3 bolt but another option would be to get one of Marvin's "nefarious arms" barrels. They are stainless steel, midlength gas system and already dimpled.
Is there much of a difference between MOD 1 and MOD 2 SR15 Upper? If I get a MOD 2 upper and replace the URX 4 with URX 3.1 is there anything else that needs to be done to ensure proper fitting?