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Posted: 4/13/2013 3:30:06 PM EDT
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So I went and shot my AR today and about half way through my 30rd mag I pull the trigger and it wouldn't pull, so I pull the slide and chamber another round, still nothing. After looking at it closer I noticed the pin had slid through and out of one of the sides causing the trigger to be on an angle and not function properly. I fixed it and put a few more rounds through it and sure enough it came out again (of the right hand side)
Anyone know why the pin is able to just move so freely or what I can do to prevent this from happening again? my gun is an M&P 15 sport |
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This isn't a J spring. The J spring retains the hammer pin, not the trigger pin.
If the trigger pin is walking out it is because the hammer spring legs aren't in the correct position. The trigger pin is held in place by the legs of the hammer spring. Read up on how to properly assemble a lower and make sure the hammer spring legs are resting on top of and in the groove on the trigger pin. Anti walk pins are a sure sign the the weapon owner doesn't understand how his weapon is supposed to be assembled. I've been shooting AR15s since 1979 both semi and FA and I have never had to use an anti walk pin. Put your lower together right and this won't be an issue. Simple and cheap cause the fix is free 
If you need another trigger pin send me an IM and I'll drop a couple in the mail to you. No sweat. |
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Quoted:
This isn't a J spring. The J spring retains the hammer pin, not the trigger pin. If the trigger pin is walking out it is because the hammer spring legs aren't in the correct position. The trigger pin is held in place by the legs of the hammer spring. Read up on how to properly assemble a lower and make sure the hammer spring legs are resting on top of and in the groove on the trigger pin. Anti walk pins are a sure sign the the weapon owner doesn't understand how his weapon is supposed to be assembled. I've been shooting AR15s since 1979 both semi and FA and I have never had to use an anti walk pin. Put your lower together right and this won't be an issue. Simple and cheap cause the fix is free
If you need another trigger pin send me an IM and I'll drop a couple in the mail to you. No sweat. Thank you sir I appreciate the advice, I will look into it online on how to properly assemble the lower and go from there |
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Quoted:
This isn't a J spring. The J spring retains the hammer pin, not the trigger pin. If the trigger pin is walking out it is because the hammer spring legs aren't in the correct position. The trigger pin is held in place by the legs of the hammer spring. Read up on how to properly assemble a lower and make sure the hammer spring legs are resting on top of and in the groove on the trigger pin. Anti walk pins are a sure sign the the weapon owner doesn't understand how his weapon is supposed to be assembled. I've been shooting AR15s since 1979 both semi and FA and I have never had to use an anti walk pin. Put your lower together right and this won't be an issue. Simple and cheap cause the fix is free
If you need another trigger pin send me an IM and I'll drop a couple in the mail to you. No sweat. now this is CORRECT good job johnreilly |
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Hammer spring in upside down. When it is upside down, there isn't enough down force to keep the leg of the spring in the trigger pin groove under recoil. Yep, that's a possibility too, but this will usually cause a misfire due to a light hammer strike, right? |
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post pictures of your assembly installed...that will answer basic questions.
I got a set of bad pins from PSA about 3 months ago. The new ones fixed the problem right away. If for some reason you still have the problem just get some anti walk pins and be done with it. |
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Looks upside down to me.
Look at the legs of the hammer pin. It should come off the bottom of the hammer pin. Would make the legs of the hammer pin parallel with the top of the receiver. Your hammer spring legs are above your hammer pin. Pull the hammer pin, remove the hammer, flip the hammer spring over so the spring "tightens" when the hammer is cocked. Reinstall and your pin walking will go away. |
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here is how my spring looks uncompressed, in order to put it in like the animation im pretty sure the legs would bend to get them that far around
http://i334.photobucket.com/albums/m424/garcia2389/2013-04-13_21-40-13_466_zps5a8c65b9.jpg http://i334.photobucket.com/albums/m424/garcia2389/2013-04-13_21-44-09_531_zpsb9983757.jpg |
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Using your man hands, push that sucker in there and pin it.
The spring lives in a pre-loaded condition where it is constantly applying pressure to the trigger pin. As stated above, the hammer pin is retained by an internal J-spring which engages the pin's center groove. |
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Using your man hands, push that sucker in there and pin it. The spring lives in a pre-loaded condition where it is constantly applying pressure to the trigger pin. As stated above, the hammer pin is retained by an internal J-spring which engages the pin's center groove. haha man hands got it in, its got alot more force now than it did before, weird though b.c it was firing everytime with less force behind it when it was upside down the trigger pin won't walk out now though THANKS FOR THE HELP FELLAS!!!! |
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Using your man hands, push that sucker in there and pin it. The spring lives in a pre-loaded condition where it is constantly applying pressure to the trigger pin. As stated above, the hammer pin is retained by an internal J-spring which engages the pin's center groove. haha man hands got it in, its got alot more force now than it did before, weird though b.c it was firing everytime with less force behind it when it was upside down the trigger pin won't walk out now though THANKS FOR THE HELP FELLAS!!!! Well done. Don't dry fire and let the hammer fall on the magwell. You knew that though.... |
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Using your man hands, push that sucker in there and pin it. The spring lives in a pre-loaded condition where it is constantly applying pressure to the trigger pin. As stated above, the hammer pin is retained by an internal J-spring which engages the pin's center groove. haha man hands got it in, its got alot more force now than it did before, weird though b.c it was firing everytime with less force behind it when it was upside down the trigger pin won't walk out now though THANKS FOR THE HELP FELLAS!!!! Well done. Don't dry fire and let the hammer fall on the magwell. You knew that though.... I do know that, I don't dry fire any of my guns |
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Hammer spring in upside down. When it is upside down, there isn't enough down force to keep the leg of the spring in the trigger pin groove under recoil. Yep, that's a possibility too, but this will usually cause a misfire due to a light hammer strike, right? It could, but it may not. I did one of my early builds wrong. I shot a bunch of mil hard primers without issue before the trigger pin walked out. Flipped the hammer spring and all was good. |
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Using your man hands, push that sucker in there and pin it. The spring lives in a pre-loaded condition where it is constantly applying pressure to the trigger pin. As stated above, the hammer pin is retained by an internal J-spring which engages the pin's center groove. haha man hands got it in, its got alot more force now than it did before, weird though b.c it was firing everytime with less force behind it when it was upside down the trigger pin won't walk out now though THANKS FOR THE HELP FELLAS!!!! Well done. Don't dry fire and let the hammer fall on the magwell. You knew that though.... I do know that, I don't dry fire any of my guns You can't hurt the AR dry firing while assembled. When it's halved, the hammer wants to fall against the magwell/bolt release. |
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Anti walk pins are a sure sign the the weapon owner doesn't understand how his weapon is supposed to be assembled. I've been shooting AR15s since 1979 both semi and FA and I have never had to use an anti walk pin.. Not always true. Usually, but not always. The Hogan, POF, and SAA (and others I'm sure) triggers need anti-walk pins to keep them in the lower. They are a drop in pack, like the Timney, but unlike the Timney they don't have set screws and need the KNS or others to keep the pins in place. And if someone has a near irreplaceable full auto lower, I can't fault them for spending $30 to eliminate any risk of hogging out the holes in their $10,000 damn near impossible to find lower. |
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Get some anti walk pins. It happens. only if your shits wrong or broke Ok I will take useless correction once on the chin twice and I will explain myself. Guy I know has generic whatever lpk. Not high quality. Legs of hammer spring would never sit right. Pins were to shallow possibly. Remedy was anti walk pins. Maybe a new hammer spring or new ordinary pins would have solved it. What I know is the anti walk pins did solve it. I don't know op's depth of knowledge. Don't know his equipment. Should have asked for a photo before my recommendation so I could see the hammer spring in backwards. I know my one encounter was probably shallow pins. Anti walks fixed it. Now get off my case with all this you know more than me p'ing contest. One correction was enough. You double stamping it makes it look like you're looking for a p'ing contest. I'm not interested in that kinda crap just trying to be helpful. Your post is in no way helpful. Just douchey! |
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Hammer spring in upside down. When it is upside down, there isn't enough down force to keep the leg of the spring in the trigger pin groove under recoil. Yep, that's a possibility too, but this will usually cause a misfire due to a light hammer strike, right? Looks like it was upside down and the OP fixed it. I've done this before. 
It operates fine, passes a function check, but the trigger pin walks. |
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Get some anti walk pins. It happens. And his lower would work, but still be assembled wrong. Uh yea as noted in my post above. So do you have a life or do you just sit around and wait for posts to flame. DUDE I REALIZED AFTER YOUR FIRST POST MINE NEEDED MORE INFO. After the second flaming I posted it. So read me walking back my over simplistic first post above and realized I had made a mistake. Find something more constructive to do than flame people who are trying to help. And for the record my first post had an bit of correctness to it based on the problem I outlined in the second. I get so sick of know it all idiots who gotta get on here to prove they can pee farther than the guy who was just trying to help. Back off captain obvious. I acknowledged it would still be assembled wrong!!!! |
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