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Posted: 8/2/2006 7:05:55 AM EDT
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Ok guys i have sbr m16 that has problems running i know big surpize. The current set up is factory car buffer and spring. Factory gas tube. I was wondering if i swap out the car stock and buff for riflr stock and buffer if it will solve this issue. The barrel length is a 11 1/2 kit upper on a reg colt m16 lower. My main issue is short stroking in auto. Works fine in semi. let me know if this is a solution or if you guys have another idea. |
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Not enough information in your post to comment on. Suggest you state the problem you are having clearly and include your barrel length and manufacturers involved in this shorty, maybe folks will then be able to help you out. YMMV, but at present, not knowing what kind of problem your having or the specifics, ya might as well call Miss Cleo for advice.....  Mike |
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Without knowing more information, there are two likely problems: 1. probably the buffer as everyone stated. Get an H or H2 buffer. 2. potentially the upper. Kit gun uppers will usually have .223 chambers that are too tight. I'd ditch that kit upper and get an LMT 10.5". You should also add a heavy duty extractor spring from SAW (available from Specialized Armamentor Wolff (available from Brownells). Try the buffer first. |
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If your weapon is short-stroking, then you do not need a heavier buffer. Short-stroking means that the bolt carrier and bolt are not coming back far enough to eject and pick up another round. Making the buffer heavier will make it even more difficult to move the bolt carrier and bolt rearward. If you are getting bolt carrier bounce, as evidenced by a live round in the chamber, the hammer down, and a light primer strike, then use a heavier buffer. What happens frequently with the shorter barrels is the person cutting the barrel down either opens the gas port up too much and this causes bolt carrier bounce, or they do not open it enough and this causes short-stroking. If ammo makes no difference, and you are having short stroking, and you are using the lightest buffer you can, then you should check to make sure the bolt carrier key is on tight, make sure your gas rings are good, and you might even try changing the gas tube. I have seen gas tubes get partially clogged from using dirty ammo. If none of this solves your problem, then you will probably need to open the gas port a little. But be careful, because if you open it too much, then you will create bolt carrier bounce. Open it in gradual increments until you get rid of the short-stroking. Don't ask what size to open your gas port to, because what works for one person's barrel may not work for yours. Sometimes the way a FSB is put on a barrel partially covers the gas port, so if that is the case on your barrel, you would have to use a larger diameter gas port than someone who has the same length barrel and their gas port is not partially covered. Also, if your barrel is Colt the chamber is looser than another manufacturer's barrel. So, work on what is right for your barrel and upper. Charles Tatum Alamo Professional Arms |
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