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Posted: 3/30/2009 7:18:10 PM
HAD THE SAME PROBLEM: HAMMER SPRING "LEGS" NEED TO BE ON THE BOTTOM OF THEIR ARC....SIMPLY PUT, MY SPRING WAS UPSIDE DOWN. LEGS WERE ON TOP. SWITCHED IT, WENT TO THE DESERT THIS WEEKEND, AND NOT ONE MISFIRE!!!
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Posted: 4/11/2009 9:35:53 PM
I've built about 20 rifles over the years. My last and most recent build I did over the dinner table with a few beers.
Went shooting today to test out an old upper I had today and the damned firing pin walked out on me. I thought, dang, I must have wore out the holes too much getting the pin in, because it was the most difficult part of the build it was so damned tight. So I was looking into getting those walkout pins and read this post...looked into my lower and OOOOOPS. How embarrassing. I had the spring in backwards as well. And to think I was going off the AR15.COM lower instructions while I was building it as well.... I think they could redo the diagram and make it idiot proof when it comes to the firing pin spring. Or make mixing beer and building a lower illegal. Anywhooooo, won't be buying any walkout pins soon. Sorry to whoever makes those things. |
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Posted: 10/31/2009 6:43:17 PM
Thank you very much. I didn't have the pin issue but I had inconsistent dimpling of primers which would result in a misfire in 2 of 5 shots. I flipped the hammer spring and voila.
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Posted: 10/3/2010 8:15:25 PM
Thanks for the thread. I had my hammer spring in backwards and was having a misfire on 3 out of five shots. Now it doesnt misfire and I wont make the same mistake on my second build.
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Posted: 11/28/2010 9:46:30 PM
[Last Edit: 11/28/2010 9:47:39 PM by TPK0999]
Thanks for this info. I remember questioning the positioning if the spring is correct. I tested it on wolf and NEVER had a problem. Then I tried X193 and click nothing.. click... nothing... 40 rds and 9 didn't fire. Odd. But thanks. You saved me alot of headache hopefully. We'll find out when I test er out!
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Posted: 6/25/2011 5:33:34 PM
Was having a ton of failure to fires on my brand new (1st time) build and I noticed my trigger pin started to come loose at one point also. Found this thread and realized my hammer spring was installed upside down! Hopefully that was all that was wrong!
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Posted: 6/28/2011 10:59:21 AM
Thanks for the sticky my new ST lower has a walking pin and ocassional mis fire. Sure enough hammer spring is backwards.
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geezhound
Really... It's not you, It's me.
Team Member
Joined: Dec 2001  PA, USA
 
 Posts: 1699 Feedback: 100% (23) Link To This Post |
Posted: 9/1/2011 2:25:26 AM
Thanks for this thread, guys!!
I've assembled 10+ lowers over the years and couldn't figure out why my new build was failing to fire and had walking pins and it was driving me nuts!!! Sure enough! My freakin' hammer spring was backwards. Quickly switched that sucker around and like magic, problem solved. Trouble shooting forum saves the day again. |
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Posted: 9/15/2011 9:45:06 AM
Thanks for all the information in this thread. Went to the range yesterday with my first self-assembled rifle (PSA Stripped lower + PSA Lpak) and had these same issues. Trigger pin walking to the right 3 times and 2 light primer strikes out of about 600 rds . I dont have the rifle with me but im betting i did something wrong. Ill find out tonight! Thanks again for all the useful information, photos etc.
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Posted: 5/7/2012 4:30:11 PM
Originally Posted By drjwelch:
<table]<tr]<td]
Originally Posted By Tweak: your hammer spring is on backwards Thanks. Fixed it. The pin does not move so easily now, cannot wait to return to the range!! looks to be in backwards |
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Posted: 5/30/2012 3:32:01 PM
my last build I also failed to pay proper attention while installing the hammer spring, I was distracted .......
as it has been stated already, if you correctly install the hammer spring your trigger pin will not walk the first pic is a incorrect installation of the hammer spring 
the second pic is a correct installation of the hammer spring  |
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Posted: 2/10/2013 7:52:10 PM
The pictures in this threas just saved another new AR build from light pin strike frustration.
Thank you all for the great pics and sharing what you know with your fellow enthusiasts!! SI |
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