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Posted: 2/28/2007 3:59:43 PM EDT
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Hey all, my brother is building a rifle and it's completed but there's one problem. He tells me that the bolt/bolt carrier won't fit all the way into the upper. He says that it slides in like it should, and then when it gets to the point where the lugs interlock, it just stops, and if he forces it, it gets stuck. Any help? Thanks alot, Tom |
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His gas tube might be slightly bent. Look here: www.ar15.com/forums/topic.html?b=3&f=4&t=317225 |
+1. Common issue. |
Based on this - ASSUMING it is installed/assembled correctly: 1. Trash in the barrel extension/lug area. 2. Out of spec upper or charging handle, rubbing/obstructing the bolt carrier and/or cam pin. 3. Out of spec carrier - not allowing the cam pin to rotate correctly. 4. Out of spec barrel - improper barrel extension install. 5. Damaged barrel extension, or major burrs on the lugs. Typically - #1 is going to be most common. All the rest are going to be very rare... unless this came from a chop-shop AR manufacturer. DO NOT shoot it if it wont lock. Find and fix the problem. |
Wow! Yes, sounds like something is definitely wrong. Follow FALARAK’s recommendation above. See if the index pin is bent or sheared. |
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