[ARCHIVED THREAD] - lower problems

Posted: 3/20/2011 7:44:21 PM EDT

I took my mid lenght upper today and used it on a new lower that I just finished building. I had all kinds of trouble today rounds not wanting to feed,jamming, and bolt not locking back on the last round. I have never had this kind of trouble out of my other lower. Any suggestions on what could be wrong? Both are Spikes lowers with Del-Ton lpk's. I am going to put my upper back on my other lower and makes sure it's not having any issues and I am going to clean my all my Pmags. Thanks

Posted: 3/20/2011 9:31:57 PM EDT

[#1]

Most times feed problems are mag related and bolt hold open problems are a short stroking issues but since you say the upper works fine on the other lower it could be a problem with the mag release on the problem lower ... either out of spec, damaged somehow or not screwed far enough into the mag release button which is letting the mags sit too low and causing the feed issues and bolt hold open problem.

Posted: 3/21/2011 6:12:01 PM EDT

[#2]

I would also check the fire control group to see if it is binding. Compare the hammer and trigger to your other lower. Be careful that you don't dry fire the lower without catching the hammer, you can crack the lower without stopping the hammer.

Posted: 3/21/2011 6:12:39 PM EDT

[#3]

Posted: 3/21/2011 6:12:53 PM EDT

[#4]

Thanks I will check the mag release and see if I can get another turn on it

Posted: 3/22/2011 4:53:53 AM EDT

[#5]

Buffer and spring is the only thing in a lower that will cause your problem
Check and make sure it's the same in both lowers

Posted: 3/22/2011 7:58:24 AM EDT

[#6]

Quoted:
Buffer and spring is the only thing in a lower that will cause your problem
Check and make sure it's the same in both lowers

Rifle length spring in a carbine extension tube? Check the length.....

Posted: 3/22/2011 7:48:28 PM EDT

[#7]

I used the stock,spring and buffer from my other lower,since I havent decided on what stock I want yet.

[ARCHIVED THREAD] - lower problems

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[ARCHIVED THREAD] - lower problems

[ARCHIVED THREAD] - lower problems