I normally don't even look at Palmetto State Armory not even to check their prices. But on a whim I looked on there because I was in the market for a bolt carrier group. They are selling toolcraft bolt carrier groups with the carpenter 158 bolt and black nitrided for 79 bucks excuse me $69 dollars. So I got on there and ordered one and got an additional 5% off because it was my first purchase. I got the bolt carrier group out the door tax and shipping for 74 bucks. My friends you can't beat that with a 2x4. Well I guess you could try but you wouldn't get very far with it. Boys you gotta love the DAILY DEAL! I got the carpenter 158 Bolt because it was a little cheaper and I have a brand-new 9310 in my parts box. They say that the 9310 if properly heat-treated is 6-8% stronger than the carpenter 158 but that remains to be seen or proven.