sig 938

I bought a Sig 938 Extreme over a year ago. It's taken me a while to warm up to but I've started carrying it and want to carry it more. I've never liked the way the magazine base plate on the Extreme protrudes from the back of the magazine. In addition to looking weird and feeling weird, this...

I'm wondering if anyone who owns a Sig 938 (standard barrel) has swapped in a threaded barrel and if you have, did the extra 1/2 inch barrel length produce better accuracy? This is a practical question for those who have done it, not a theoretical question.