The gap is .005. That was a good fit. I had to take some metal off of the ratchet. In retrospect, I should have just used the original ratchet...but I decided to file down the new ratchet to match the profile of the original. It was a learning experience if nothing else. Glad that I did it. The gun weighed in at about 12 oz., maybe a tad lighter. I need an accurate scale.