Mark,
I recently purchased a IAI 30 carbine. I had problems with it at the range,the gun pierced primers and was not reliable. I sent the gun back to Iai. My gun was returned in less than two weeks. they had replaced the barrel, upgraded the bolt to a m2 bolt and replaced the rear sight. I recently went to the range and fired the gun. My gun now functions flawlessly and will shoot two inch groups at 75 yards with winchester ammo. I am very pleased with the gun now.