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Posted: 2/21/2016 12:20:32 PM EDT
Ever had a front takedown pin that you could not drive out ? Well, yesterday a guy brought one to me to remove. He put the spring and detent in, pushed the pin across to locked position ( no upper on it ) and now you can't get it to move back even if you hammer on it with a punch. Anyone have this happen and if so, how did you resolve the problem ?
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It's possible the detent itself is bent. I had that happen to a guy who took our AR build class. I think the pin itself was out of spec and the hole for the detent was too deep which in turn mangled it when I tried to hammer it out.
If I recall we dremeled off the pin and replaced everything. |
I think you are right. I sent him to a friend that has a milling machine. I tried to drill the end of the pin but the drill would't even begin to start. Here's a thought, what if they made that pin with a small hole going all the way through the detent hole that would allow a small diameter pin / wire to push the detent back through the head of the takedown pin.
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Quoted:
Ever had a front takedown pin that you could not drive out ? Well, yesterday a guy brought one to me to remove. He put the spring and detent in, pushed the pin across to locked position ( no upper on it ) and now you can't get it to move back even if you hammer on it with a punch. Anyone have this happen and if so, how did you resolve the problem ?
See if you can get an Xacto knife blade in between the pin head and receiver an work the detent back.... |
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We tried but there wasn't enough space to get a blade in between. He took it to a guy that hammered the pin out, breaking the detent. How he managed not to break the spring/detent cavity opening on the lower, I don't know  He said the detent hole in the pin was twice as deep as others, he will be contacting the parts kit mfg. about. I know from now on I will inspect everyone before I install one. I really like how STAG has theirs made. Tiny hole where only the point of the detent goes in, not the whole pin/\.
Quoted:
See if you can get an Xacto knife blade in between the pin head and receiver an work the detent back.... Quoted:
Quoted:
Ever had a front takedown pin that you could not drive out ? Well, yesterday a guy brought one to me to remove. He put the spring and detent in, pushed the pin across to locked position ( no upper on it ) and now you can't get it to move back even if you hammer on it with a punch. Anyone have this happen and if so, how did you resolve the problem ?
See if you can get an Xacto knife blade in between the pin head and receiver an work the detent back.... |
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Quoted:
We tried but there wasn't enough space to get a blade in between. He took it to a guy that hammered the pin out, breaking the detent. How he managed not to break the spring/detent cavity opening on the lower, I don't know He said the detent hole in the pin was twice as deep as others, he will be contacting the parts kit mfg. about. I know from now on I will inspect everyone before I install one. I really like how STAG has theirs made. Tiny hole where only the point of the detent goes in, not the whole pin/\.
Quoted:
We tried but there wasn't enough space to get a blade in between. He took it to a guy that hammered the pin out, breaking the detent. How he managed not to break the spring/detent cavity opening on the lower, I don't know He said the detent hole in the pin was twice as deep as others, he will be contacting the parts kit mfg. about. I know from now on I will inspect everyone before I install one. I really like how STAG has theirs made. Tiny hole where only the point of the detent goes in, not the whole pin/\.
Quoted:
Quoted:
Ever had a front takedown pin that you could not drive out ? Well, yesterday a guy brought one to me to remove. He put the spring and detent in, pushed the pin across to locked position ( no upper on it ) and now you can't get it to move back even if you hammer on it with a punch. Anyone have this happen and if so, how did you resolve the problem ?
See if you can get an Xacto knife blade in between the pin head and receiver an work the detent back.... Same issue I ran into then eh? It was a fucking bitch to figure out.. |
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I think you are right. I sent him to a friend that has a milling machine. I tried to drill the end of the pin but the drill would't even begin to start. Here's a thought, what if they made that pin with a small hole going all the way through the detent hole that would allow a small diameter pin / wire to push the detent back through the head of the takedown pin. Seemed like a simple fix. Insert paperclip into detent release hole. Pull out. |
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Here's a question: Why is there a hole in the front pivot pin spring/detent cavity? I read awhile back the main reason for it is to allow milling particles, machining oil/coolant, as well as anodizing chemicals to drain/vent so they don't bleed out into the anodizing during the process of making the lower. But it can also serve as a dain hole to allow grit and water to escape as well so the spring and plunger don't lock up from build up. |
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I read awhile back the main reason for it is to allow milling particles, machining oil/coolant, as well as anodizing chemicals to drain/vent so they don't bleed out into the anodizing during the process of making the lower. But it can also serve as a dain hole to allow grit and water to escape as well so the spring and plunger don't lock up from build up. Quoted:
Quoted:
Here's a question: Why is there a hole in the front pivot pin spring/detent cavity? I read awhile back the main reason for it is to allow milling particles, machining oil/coolant, as well as anodizing chemicals to drain/vent so they don't bleed out into the anodizing during the process of making the lower. But it can also serve as a dain hole to allow grit and water to escape as well so the spring and plunger don't lock up from build up. More like this This rifle design doesn't always sit in a safe. It goes to war in dirty, wet places |
| Happened last weekend on a buddies new PSA Freedom rifle kit in an Anderson lower. Rear pin though. First time out with it, took a few good wacks to get it moving but after that it seemed to work alright. We figured the detent was just a little deeper than normal. |
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Quoted:
I think you are right. I sent him to a friend that has a milling machine. I tried to drill the end of the pin but the drill would't even begin to start. Here's a thought, what if they made that pin with a small hole going all the way through the detent hole that would allow a small diameter pin / wire to push the detent back through the head of the takedown pin. 2A Armament makes their titanium set that have a hole all the way through and a small on on the side to get a punch through. http://www.primaryarms.com/2a-ti-tdp/p/2a-ti-tdp/ Best way to get the detent and spring out is with a very very very thin scalpel. Get the edge between the detent and pin and release it like that. Ive had that problem with Marines gorrila handling them before and this always worked. Also had a Corpsman use 12 feet of gauze as a cleaning patch. Got that nice and compressed in a 14 inch barrel. That was fun. |
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