Can you comment on the dimensions? I like my IWC SCAR Charger, but if you're not careful the barrel extension retaining screws will take a bite out of you. I'm wondering if this is any better.I received my Apex bolt handle today. The shaft of the Apex handle will not fit in the hole of my carrier. Not even close to going in. It is too large in diameter. I have not measured the two handles yet, but I will before I call Apex on Monday. The Apex shaft even looks larger than the stock shaft. Quality of the part is fantastic. Too bad it does not fit.