Sorry I missed this BSA. I have not done an official measurement yet so I could not give you a definite answer on what if any length I have added. I have taken some non official measurements just to see if I was on the right track and I was showing roughly 1/4 to 3/8" improvement on bpfsl. I will measure later this month and I am hoping for 1/2" but I will have to wait and see.