AR Sponsor
Posted: 10/25/2010 9:12:24 AM EDT
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Stupid question time but I gotta know. Buddy has cracked upper receiver, the crack is towards the back on the side. He shot his rifle for at least 500 or so rounds with it like this and never had a problem. Was discovered during his semi-annual cleaning of the rifle and has since been replaced with a new receiver. Can you build and trust a receiver that has a small crack? It is not in a stress area of any kind. Just thinking about using it for a beater, trunk gun kind of weapon or maybe a .22 upper. |
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Out of curiosity, what was the manufacturer? And can we get some pics? Things like this are good to add to the data pool.
Also... Throw the thing away, dont shoot it. Like the other guy said, with the cost of a replacement upper receiver whats the benefit to risking it? You can get a new stripped one for 50ish bucks. |
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Make some (non-firing) AR art out of it. +1 And next time use the correct blocks installing the barrel 458 What? 
Factory upper was an older bushmaster that has about 10K plus rounds through it. I'm sure Bushmaster uses the right blocks to install their barrels. |
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Make some (non-firing) AR art out of it. +1 And next time use the correct blocks installing the barrel 458 What?
Factory upper was an older bushmaster that has about 10K plus rounds through it. I'm sure Bushmaster uses the right blocks to install their barrels. This would have been pertinent information right from the get go. Why withhold this information? To answer you question, Don't shoot it. |
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As long as the carrier moves properly and bolt locks up there should not be a problem in firing. The bolt and barrel extension take all the pressure and are the safety points to worry about.
"If" the crack got big enough and traveled, it might throw trigger/sear alignment off so as to create an unsafe condition but only examination and monitering of the problem can determine that. |
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Quoted:
As long as the carrier moves properly and bolt locks up there should not be a problem in firing. The bolt and barrel extension take all the pressure and are the safety points to worry about. "If" the crack got big enough and traveled, it might throw trigger/sear alignment off so as to create an unsafe condition but only examination and monitering of the problem can determine that. how could a cracked upper affect the trigger/sear engagement...unless a piece totally broke off, and somehow found it's way into the fcg pocket |
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Stupid question time but I gotta know. Buddy has cracked upper receiver, the crack is towards the back on the side. He shot his rifle for at least 500 or so rounds with it like this and never had a problem. Was discovered during his semi-annual cleaning of the rifle and has since been replaced with a new receiver. Can you build and trust a receiver that has a small crack? It is not in a stress area of any kind. Just thinking about using it for a beater, trunk gun kind of weapon or maybe a .22 upper. pics or it never happened |
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Quoted:
Quoted:
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Make some (non-firing) AR art out of it. +1 And next time use the correct blocks installing the barrel 458 What?
Factory upper was an older bushmaster that has about 10K plus rounds through it. I'm sure Bushmaster uses the right blocks to install their barrels. Are you absolutely sure it was a factory bushmaster that had never been tinkered with by someone using a flipper or a claw block? Either way I would remove it from service. |
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Quoted:
As long as the carrier moves properly and bolt locks up there should not be a problem in firing. The bolt and barrel extension take all the pressure and are the safety points to worry about. "If" the crack got big enough and traveled, it might throw trigger/sear alignment off so as to create an unsafe condition but only examination and monitering of the problem can determine that. ^^ This. But if it got bad enough that trigger/sear alignment was a problem the BCG probably would not be moving smoothly it its channel either. There is nothing unsage about using this upper. That said, I would just pay the price for a new one. |
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Quoted:
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As long as the carrier moves properly and bolt locks up there should not be a problem in firing. The bolt and barrel extension take all the pressure and are the safety points to worry about. "If" the crack got big enough and traveled, it might throw trigger/sear alignment off so as to create an unsafe condition but only examination and monitering of the problem can determine that. ^^ This. But if it got bad enough that trigger/sear alignment was a problem the BCG probably would not be moving smoothly it its channel either. There is nothing unsage about using this upper. That said, I would just pay the price for a new one. again I ask, how is a cracked upper supposed to throw the alignment of the trigger/sear off that's housed in the lower?? |
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Quoted:
Quoted:
Quoted:
Quoted:
Make some (non-firing) AR art out of it. +1 And next time use the correct blocks installing the barrel 458 What?
Factory upper was an older bushmaster that has about 10K plus rounds through it. I'm sure Bushmaster uses the right blocks to install their barrels. This would have been pertinent information right from the get go. Why withhold this information? To answer you question, Don't shoot it. Didn't want this to be a Bushmaster trashing contest. I really don't see what the manufacturer has to do with this problem anyway. It is a damaged piece and I was wondering if it is still serviceable or not. Plain and simple. |
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Quoted:
Quoted:
Quoted:
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Make some (non-firing) AR art out of it. +1 And next time use the correct blocks installing the barrel 458 What?
Factory upper was an older bushmaster that has about 10K plus rounds through it. I'm sure Bushmaster uses the right blocks to install their barrels. Are you absolutely sure it was a factory bushmaster that had never been tinkered with by someone using a flipper or a claw block? Either way I would remove it from service. Dude said he bought new in the box and has never had any trouble with it. He is pretty rough with it and doesn't clean it very often. He did say it has taken a few nasty spills during his hunting trips and that was probably how it happened. |
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Quoted:
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As long as the carrier moves properly and bolt locks up there should not be a problem in firing. The bolt and barrel extension take all the pressure and are the safety points to worry about. "If" the crack got big enough and traveled, it might throw trigger/sear alignment off so as to create an unsafe condition but only examination and monitering of the problem can determine that. how could a cracked upper affect the trigger/sear engagement...unless a piece totally broke off, and somehow found it's way into the fcg pocket Guess I was thinking too fast, crack in upper would not affect anything in the lower.!! |
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Quoted:
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Make some (non-firing) AR art out of it. +1 And next time use the correct blocks installing the barrel 458 What?
Factory upper was an older bushmaster that has about 10K plus rounds through it. I'm sure Bushmaster uses the right blocks to install their barrels. This would have been pertinent information right from the get go. Why withhold this information? To answer you question, Don't shoot it. Didn't want this to be a Bushmaster trashing contest. I really don't see what the manufacturer has to do with this problem anyway. It is a damaged piece and I was wondering if it is still serviceable or not. Plain and simple. I wasn't talking about the MFG. I was talking about the round count. |
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If the crack is in a non stressed part then I'd just keep an eye on it. There isn't really any force on an upper save for right at the lugs, the rest of it doesn't have anything to do but keep the carrier in line and hold the charging handle. Oh..oh... I got into a shit storm by suggesting that. Finally got my point across that an AR could be fired sans bolt carrier, upper. So I agree the damaged upper will still function Good luck 458 |
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If the crack is in a non stressed part then I'd just keep an eye on it. There isn't really any force on an upper save for right at the lugs, the rest of it doesn't have anything to do but keep the carrier in line and hold the charging handle. Oh..oh... I got into a shit storm by suggesting that. Finally got my point across that an AR could be fired sans bolt carrier, upper. So I agree the damaged upper will still function Good luck 458 I don't mind because it's a stone cold factual statement. |
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If the crack is in a non stressed part then I'd just keep an eye on it. There isn't really any force on an upper save for right at the lugs, the rest of it doesn't have anything to do but keep the carrier in line and hold the charging handle. No way. You need to get on the bandwagon. When ever someone asks a question you should respond by telling them to throw the part away or by telling them "it won't work". Remember these ar-15 rifles are guns and guns are complicated and dangerous. |
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