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Posted: 5/1/2013 11:12:02 AM EDT
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Today was the first day I got to shoot my new AR Pistol build and I had a majoralfunction. Two of the locking logs on my bolt sheared clean off! Any thoughts about how the hell this happened? Pictures below.
http://i186.photobucket.com/albums/x268/mack4life8/AR15%20Bolt/ba54a59e-2f5b-47af-a137-285eba770fd2.jpg http://i186.photobucket.com/albums/x268/mack4life8/AR15%20Bolt/a0a0dc68-2e9c-494d-b9de-147aff3d40cb.jpg http://i186.photobucket.com/albums/x268/mack4life8/AR15%20Bolt/45a57fe9-3acb-4c64-9c2d-4185cb665003.jpg http://i186.photobucket.com/albums/x268/mack4life8/AR15%20Bolt/68528c0f-9b17-4298-b7f5-a85ac8ce3002.jpg |
| Just got my replacement bolt back after sending in one that had the exact same thing happen. The guy I got it from had called a couple weeks earlier saying they had a bad batch of bolts come in. I told him mine looked find and had fired 150-200 rounds with it at the time, and I would let him know if anything came up. Two weeks later a friend was shooting it and after 3 or 4 shots this happened. I called and sent it to him and got my replacement in less than a week. |
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Three rounds were fired total. Bolt was brand new, and came with my carrier group. Was purchased on eBay back in January time frame, was supposed to be a new frontier armory ceramic bcg. Ammo was independence 5.56. I've never heard of a ceramic BCG. Stoner makes a "ceramic" coated BCG |
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They are the only ones I am aware of who do make a ceramic. http://www.midwayusa.com/product/284996/ar-stoner-enhanced-bolt-carrier-assembly-mil-spec-ar-15-223-remington-ceramic-plated Their bolts are supposed to be made of 8620 instead of Carpenter 158. They are pretty quickly establishing a reputation for themselves. |
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Just got my replacement bolt back after sending in one that had the exact same thing happen. The guy I got it from had called a couple weeks earlier saying they had a bad batch of bolts come in. I told him mine looked find and had fired 150-200 rounds with it at the time, and I would let him know if anything came up. Two weeks later a friend was shooting it and after 3 or 4 shots this happened. I called and sent it to him and got my replacement in less than a week. What brand were you using that had this issue? Was it also purchased online? |
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Three rounds were fired total. Bolt was brand new, and came with my carrier group. Was purchased on eBay back in January time frame, was supposed to be a new frontier armory ceramic bcg. Ammo was independence 5.56. I've never heard of a ceramic BCG. Stoner makes a "ceramic" coated BCG Must be like those ceramic Glock 7s. John McClane told me about those. ~Augee |
I just started a new build, i'm really hoping I dont end up with one of these crap BCGs.
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Quoted: Quoted: Three rounds were fired total. Bolt was brand new, and came with my carrier group. Was purchased on eBay back in January time frame, was supposed to be a new frontier armory ceramic bcg. Ammo was independence 5.56. I've never heard of a ceramic BCG.  ceramic coated not made of ceramic. people wonder where reporters and politicians get ther dumb ideas from. |
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That's not a lot of brass.
You can see that kind of brass marks on BCM bolts just from their test firing. This is well established. Some brass is software than others. I wouldn't consider that. As said above - most likely candidate is cheap bolt. The fact you bought it from Ebay says a lot....... don't buy gun parts from ebay. Buy them from REPUTABLE dealers here with REPUTABLE brands that stand behind the products they manufacture, distribute, or sell. Support the people who support this site. Not ebay. |
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Just got my replacement bolt back after sending in one that had the exact same thing happen. The guy I got it from had called a couple weeks earlier saying they had a bad batch of bolts come in. I told him mine looked find and had fired 150-200 rounds with it at the time, and I would let him know if anything came up. Two weeks later a friend was shooting it and after 3 or 4 shots this happened. I called and sent it to him and got my replacement in less than a week. What brand were you using that had this issue? Was it also purchased online? I couldn't tell you, it doesn't have any markings that I have seen. I got it from KAK Industry, who got it from a different supplier. |
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Oh boy, I just picked up one of those Stoner BCG makes me wonder if should even use it? I guess at the very least I might swap out bolts. OP, is the bolt that failed MPI marked? The bolt that came with mine it. Sir James... MPI doesn’t mean anything other than the steel it is structurally sound when it was tested , AR Stoner bolts that come on the BCG in the 140 dollar range are not properly hardened….they are too soft……at least a few batches of them were and I got one. Replaced with a RRA bolt, using the stoner carrier and life is good, not a mark on the bolt. 200 rounds AR Stoner bolt 
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Three rounds were fired total. Bolt was brand new, and came with my carrier group. Was purchased on eBay back in January time frame, was supposed to be a new frontier armory ceramic bcg. Ammo was independence 5.56. Don't buy important parts from questionable sellers selling questionable parts on eBay. Given the source of the bolt, I'd say that's the likely culprit, although it could be an ammo issue. |
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It was most likely a bad bolt made with poor quality materials. Since December, there has been a ton of people and manufactures trying to make money off of the current gun control scare. People who have no business making these parts have been trying to flood the market with sub standard merchandise for the past 4 months. This is what happens when you buy a BCG on EBAY. Stick to getting vital parts from trust worthy distributors and you will be okay.
Bolts should be made using Carpenter 158 or 9310. Some manufacturers have been switching to 9310 due to it being a little harder and less brittle. |
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