Shooting Times .45ACP&.223 Autoloaders magazine just did a 10,000 round report on a Colt Match Target HBAR. They used PMC 55-grain FMJ Target ammo. The test was done over a 2-1/2 day period in this maner: First the weapon was bench fired for group accuracy @ 100-yds.(I will give group details below) Then they fired one thousand rounds in a steady cadence, cleaned the weapon and bench fired again for accuracy. They repeated this procedure for the full 10,000-rd test. The weapon never malfunctioned through the entire test! Although no malfunctions occured, the barrel throat was badly eroded after 9,000-rds. Here is a list of the groups fired from a benchrest after each 1,000-rds.[left]Round ct. 0(zero) accuracy 1.52(inches)[/left][left]1,000 rds=1.48[/left][left]2,000 rds=1.51[/left][left]3,000rds=1.47[/left][left]4,000rds=1.33[/left][left]5,000rds=1.55[/left][left]6,000rds=1.29[/left][left]7,000rds]=1.52[/left][left]8,000rds=0.79[/left][left]*9,000rds=*1.89[/left][left]*10,000rds=*1.21[/left].....*For the 9,000-10,000rd accuracy tests they used Hornady 55-grain SP ammo. This was because the barrel throat erosion caused the PMC ammo to keyhole. I think this is a good example of the AR15's excellent reliability. The normal life of an AR15 was compressed into a 2 1/2 day period without a single malfunction. The barrel was expectedly ruined after the marathon shooting session, but the rest of the weapon was ready for a lot more.