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Posted: 4/25/2011 12:00:45 PM EDT
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I have three factory built AR's, and decided to build one myself. Well, at least the lower, the upper I ordered complete. I am not an expert, but I feel like I have a pretty decent understanding of how the AR15 works, and guns in general. My parts are as follows:
Spikes Stripped Reciever Palmetto State Armory MOE LPK complete with buffer Spikes lightweight upper from AIM I shot it yesterday for the first time, and had a major problem. Keep in mind that I did function test the trigger/safety with the upper attached prior to shooting it, and all seemed nomal. I inserted a mag and chambered a round. Fired the first shot, did great, and then came the problem. I noticed that the trigger did not reset, I guess, and when I pulled the trigger again it felt like it does after you dry fire. It did eject the spent case and chambered a fresh round. I pulled the charging handle and fired another round. I was using Federal XM193. Same problem, no reset. I tried a couple of different brands, no luck, all same. Then the scary part, when I picked up my unfired rounds off the ground that I had ejected when it malfunctioned, the primer had been slightly struck on all of them, I guess just not hard enought to ignite. WTF? It seems as though the hammer is dropping immediately when the new round is chambered? I am glad it didn't spit out a burrrrp, full auto style. Well, kinda. 
Next, I tried the complete upper on a different lower, and everything was fine, so it seems to be the new lower I built that is malfunctioning. Anyone know which NEWB mistake I might have made? I examined the lower along with another functional one, and it seems to be put together the same. I built it using FALARAK's tutorial. |
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Review the trigger install part of this post and double check that you did it right…
That would be my first guess. (Backwards hammer spring or missing disconnector spring) http://www.ar15.com/forums/topic.html?b=2&f=282&t=186316 |
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Yepper, forgot the disconnector spring. The sneaky little bastard is green, and it just so happens to match the gun cleaning mat that I used to put it together. Never even saw it until I read the link, and realized that I didn't remember putting that one in. It was sitting there just laughing at me fail.
Thanks Arfcom! You guys never fail. |
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Quoted:
Review the trigger install part of this post and double check that you did it right… That would be my first guess. (Backwards hammer spring or missing disconnector spring) ^ This All chambered rounds will have a light primer strike on them so you are fine there. |
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Quoted:
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Review the trigger install part of this post and double check that you did it right… That would be my first guess. (Backwards hammer spring or missing disconnector spring) ^ This All chambered rounds will have a light primer strike on them so you are fine there. Hmm, I didn't know that. Thanks. |
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Quoted:
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Review the trigger install part of this post and double check that you did it right… That would be my first guess. (Backwards hammer spring or missing disconnector spring) ^ This All chambered rounds will have a light primer strike on them so you are fine there. Hmm, I didn't know that. Thanks. The light primer strikes are caused by the firing pin lightly hitting the primer when the bolt/carrier is released. |
The primer dimple is normal, even with a fully functional AR (or any firearm with a free float fire pin). Granted, the dimple may be a little more than a typical freefloat firing pin strike since your hammer was following your carrier, but don't be too worried about the slightly dimpled primer you will always have that. 
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