huntking, your reply was more in line with my question. I know that carbines seem to increase velocity by 300 to 500 fps I think. Might be off on those figures,but you see where I'm going. I guess the real question;is where is the best bang so to speak for your buck in length? It seems that 7 1/2 might be the sweet spot without going custom or getting to long with out a significant incress. Does this make sense to anyone but me?I know for each inch in length there is an increase but I would think at some point it tapers off or is not worth the extra length. Any help or am I being to critical.Thanks for the help.