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Posted: 10/14/2014 4:10:37 PM EDT
[#1]
Type of magazine?
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Posted: 10/14/2014 4:35:02 PM EDT
[#2]
Dont pull the charging handle to load the first round. Lock the bolt back, load a full magazine, then hit the mag release. It should strip the first round and chamber it.
Most people that pull back on the charging handle don't pull back far enough or ride the bolt forward or Both.
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Posted: 10/14/2014 5:04:36 PM EDT
[#3]
I tried with Pmags and regular Military style 30 rounders. The mags are blocked to 15 since I live in NJ but they work in my other ARs. I tried to load it with less ammo and it still wouldn't work. I didn't try to load it by the bolt release. I was definitely pulling the bolt back correctly. It would not close all the way and you would have to push the charging handle forward a little bit to get it to lock in place.
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Posted: 10/14/2014 5:49:35 PM EDT
[#4]
have you cleaned and used clp on this new upper yet the chamber may have a build up of shipping grease or junk
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Posted: 10/14/2014 7:51:03 PM EDT
[#5]
The chamber is clean. Could it be a bolt issue/buffer ?
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Posted: 10/14/2014 8:48:37 PM EDT
[#6]
Quoted:
I took my bushmaster M4a1 ban compliant out to the range for the first time and it is not loading correctly. The gun was not a factory assembled gun. It was a mating of a factory Bushmaster lower with fixed stock and a new in box Bushmaster upper. It has a carbine length spring and buffer installed. When you pull the charging handle to load the first round it will load the round and not close the charging handle all the way or it will fail to strip the top round off and close all the way. The action cycles fine when there is no mag in the gun. I have tried several mags and different types with the same results. Any ideas? Does the fixed stock run a rifle length tube? That will lessen your spring tension and also cause the bolt key to over travel and hit the back of the receiver if you use carbine buffer and spring. |
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Posted: 10/14/2014 9:00:27 PM EDT
[#7]
It is a Bushmaster fixed collapsible style stock from the AW ban era. I just found this old thread. http://www.ar15.com/archive/topic.html?b=8&f=9&t=309386
It sounds like I might need a rifle length buffer and spring? |
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Posted: 10/14/2014 10:19:41 PM EDT
[#8]
Completely clean and generously lube the exterior contact points on the bolt carrier and the lugs on the bolt. A drop of oil inside the bolt carrier is needed as well. You may want to use Gun Scrubber or a similar product to strip the meat clean on all the internal surfaces before applying lube. The barrel and particularly the chamber need to be scrubbed to remove any preservatives or rust preventatives that may have been applied at the factory.
This should be done whether you replace the buffer and buffer spring with the standard rifle unit or not. New rifles need to cleaned and well lubed. It helps to break them in. The standard A1/A2 style stock requires a rifle buffer and spring whether you have a 16" or 20" barrel. They are cheap and easy to swap out. Your stock should function fine with a carbine spring and buffer. |
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Posted: 10/14/2014 11:11:52 PM EDT
[#9]
I am using the same stock as this and it shows a rifle length buffer?
http://www.armslist.com/posts/1758964/jackson-mississippi-gun-parts-for-sale--bushmaster-fixed-style-post-ban-ar-stock---reduced |
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Posted: 10/15/2014 2:24:54 PM EDT
[#10]
Quote HistoryQuoted:
It is a Bushmaster fixed collapsible style stock from the AW ban era. I just found this old thread. http://www.ar15.com/archive/topic.html?b=8&f=9&t=309386 It sounds like I might need a rifle length buffer and spring? From the first pic you showed you have a pinned carbine stock, your buffer and spring should be correct. Like others have said, prolly just a little cleaning and or break in will make it run. |
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Posted: 10/15/2014 6:06:46 PM EDT
[#11]
Quoted:
I took my bushmaster M4a1 ban compliant out to the range for the first time and it is not loading correctly. The gun was not a factory assembled gun. It was a mating of a factory Bushmaster lower with fixed stock and a new in box Bushmaster upper. It has a carbine length spring and buffer installed. When you pull the charging handle to load the first round it will load the round and not close the charging handle all the way or it will fail to strip the top round off and close all the way. The action cycles fine when there is no mag in the gun. I have tried several mags and different types with the same results. Any ideas? Your fixed stock some weird version that uses the carbine spring and buffer? |
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Posted: 10/15/2014 7:49:06 PM EDT
[#12]
I posted on a local gun forum and somebody else has one of these stock and it runs with a standard buffer and spring. I just measured my fixed collapsible stock buffer tube and a spare A1/A2 buffer tube. They are both the same length internally so that means I need a standard buffer and spring right?
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Posted: 10/19/2014 1:10:57 AM EDT
[#13]
Quote HistoryQuoted: I posted on a local gun forum and somebody else has one of these stock and it runs with a standard buffer and spring. I just measured my fixed collapsible stock buffer tube and a spare A1/A2 buffer tube. They are both the same length internally so that means I need a standard buffer and spring right? Pushing the charging handle? Or the forward assist? If the charging handle, take a look at the way the bcg and the gas tube fit, could be the tube is bent a little. |
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Posted: 10/19/2014 2:12:53 AM EDT
[#14]
Sounds like you need a rifle spring and buffer?
I wouldn't do anything but swap out the spring and buffer
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Posted: 10/19/2014 5:17:55 AM EDT
[#15]
To determine if the stock assembly requires a carbine or full length buffer set up, pull back on the charging handle and see where the face of the bolt stops in regards to the back of ejection port window edge.
If the buffer and spring are correct for the set up, the face of the bolt should stop 1/8" to 1/4" in front of the back of the ejection port window. If the bolt face retracts back past the back of ejection port, do not shoot the rifle since as stated, the B/C is not being stopped correctly at the back of ejection stroke, and the back of the key will crash into the back of the lower receiver at the threaded section of the tube to crack the receiver. On the other side of the coin, if the buffer and spring are too long, then the bolt will not retract back past the mag catch, and the rifle will not be able to correctly strip a round out of the mag during cycle. As for springs, carbine spring is around 10.5", while a full length buffer spring is 11.75" instead. Lastly, buffer and buffer spring have nothing to do with the upper receiver. The needed buffer and spring lengths are determined by the length of the receiver extension inner void length only (buffer tube, with the telescoping stock tube shorter than a fixed length tube, and whey you have the two different buffer and spring lengths). |
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Posted: 10/20/2014 12:12:01 AM EDT
[#16]
The bolt face goes behind ejection port with carbine length buffer and spring. It stops with about a 1/8" to a 1/4" with full length buffer and spring. I would say that was the issue. I will try to test it this week.
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