Hi guys, I just built an extremely light weight AR15.  Right now it comes in at just over 4 lbs 5 oz, and it handles exceptionally well.  I was able to achieve this weight by utilizing a sabertube instead of a stock and an aluminum bolt carrier couple with an extremly light weight taccom buffer system.  I'm actually looking to shave the last 5 oz off of the rifle, and I have a fairly definitive plan for doing so.  Unfortunately it involves shedding more mass in the lower receiver area.  So yes, the gun is fairly front "heavy".  For you experienced guys, do you like having a rifle's center of mass where you hold it at the foregrip or further back between your shoulder and your front hand.  

Thanks

 Forget it, trowe.  Once you start down the ultralight path, you inevitably give up any control over fore and aft balance, not that there was much to begin with in AR rifles.  You are taking off weight wherever you can find it and the more you take out of the lower, the more muzzle heavy it becomes.  At 4 lbs, 5 oz, no small feat, you should already be feeling that effect.  However, in view of the overall weight reduction results, if it were my rifle, I would not consider the muzzle heaviness to be a significant problem. - CW

At 4lb your extremely light.  Balance is far less of an issue at low weight.

Thanks for the replies.  My goal is to be able to engage targets, from left to right, as quickly as possible.  In my mind, that means that having my fore hand on the center of mass would give me the most control.  I think this is the question I meant to ask.  Should I be gripping in front of, behind, or right on the center of mass for ultimate control?  Can anyone speak from experience?  I'm trying to get some targets set up so that I can apply this and add weight to the rifle in different areas to really find out which works best for me.  Until then, I'd like to see if anyone has any preliminary data.

This is a very interesting question and I (an admitted tactical newb) would also like some insight. For side to side targetting I would think CofG in line with pivot point would be optimum but recoil may be a concern. But honestly idk cuz I'm outa my depth here but ocd dictates I must spread my opinion....so it can infect other opinions...just watch....next we will be agreeing