Thanks for you help so far.
ArmedSuspect I agree totally with your assessment, it appears terminal performance of the 5.56 is compromised out of a 14.5 inch barrel (with M855), let alone anything shorter. I'm really interested in moving to the 10.5" to 12.5" barrel length, to keep the entry/PDW qualities. However, the situation, is I'm new to the team, so I'm last in line in seniority, but I made the mistake of telling someone I build my own ar15's and surprise, I get tasked with this. I don't control the purse strings so anything that costs more than a $100, is gonna be a hard sell. As it is, I'm on off days and have better things to do then tinker with this weapon, it has been shelved this long, it can wait a day or two.
As far as ammo goes, duty stuff is Federal tactical loaded with 55gr Nosler Ballistic Tips, so there should be no lead fouling. Also seeing how stingy they are with ammo, not much of that is being shot except to confirm same poa/poi as 55gr fmj.
DPMS, I recorded your information, and I will call when I have narrowed down the main issue. I don't know where you guys aquire buffer tubes, but two carbine stock tubes have turned in the receiver end plates, ruining a portion of the threading. Or is that common to all carbines.
I just hope once this thing is working, I can pass it along. I would like something different for a Patrol/SWAT rifle.