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Rifles, Reloading, Optics, Equipment
Gunsmithing
New Member in need of AR-15 Guru.
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<blockquote data-quote="NesikaChad" data-source="post: 338402" data-attributes="member: 7449"><p>Reading your post you sound like you've gone through the bulk of the possible issues.</p><p></p><p>A good thing.</p><p></p><p>What's the round count on the gun and how is it used? is it a service rifle? I ask cause Jewel triggers are popular with them and S/R shooters typically consume more ammo than most.</p><p></p><p>Have you checked the wear on the end of the gas tube? Believe it or not these are consumables and do need to be replaced. The "bulb" on the end that acts like a partial seal will wear over time. It may need to be replaced.</p><p></p><p>Next, have you changed ammunition/bullet weight at all? Direct gas operating systems are more sensitive to these changes. If all else fails, perhaps try shooting some 75/80 grain bullets through the thing and see if it duplicates the condition.</p><p></p><p>How did you check your gas rings? When I went to the Colt school and the supplemental course that the State Dept. has I was told that the gas rings should support the weight of the bolt carrier with the bolt at full extension. Just pull the bolt and set the whole assy on a table. A firm rap on the table with your fist should allow the bolt to collapse somewhat. If it drops all the way then the rings are probably shot.</p><p></p><p>If you go with the one piece spiral rings there is a break in period. In 2001-03 I spent a fair amount of time with the USMC-R shooting team and they experimented with these types of rings quite a bit. They did see an improvement in how the guns held elevation at 600 yards but they were a little more temperamental at first. It takes about a hundred rounds for them to settle in. They also wear faster than the single rings but this may be due to the elevated loads that are typically used when shooting 80 grain bullets at 600 yards.</p><p></p><p>Hope this helped.</p><p></p><p>Chad</p></blockquote><p></p>
[QUOTE="NesikaChad, post: 338402, member: 7449"] Reading your post you sound like you've gone through the bulk of the possible issues. A good thing. What's the round count on the gun and how is it used? is it a service rifle? I ask cause Jewel triggers are popular with them and S/R shooters typically consume more ammo than most. Have you checked the wear on the end of the gas tube? Believe it or not these are consumables and do need to be replaced. The "bulb" on the end that acts like a partial seal will wear over time. It may need to be replaced. Next, have you changed ammunition/bullet weight at all? Direct gas operating systems are more sensitive to these changes. If all else fails, perhaps try shooting some 75/80 grain bullets through the thing and see if it duplicates the condition. How did you check your gas rings? When I went to the Colt school and the supplemental course that the State Dept. has I was told that the gas rings should support the weight of the bolt carrier with the bolt at full extension. Just pull the bolt and set the whole assy on a table. A firm rap on the table with your fist should allow the bolt to collapse somewhat. If it drops all the way then the rings are probably shot. If you go with the one piece spiral rings there is a break in period. In 2001-03 I spent a fair amount of time with the USMC-R shooting team and they experimented with these types of rings quite a bit. They did see an improvement in how the guns held elevation at 600 yards but they were a little more temperamental at first. It takes about a hundred rounds for them to settle in. They also wear faster than the single rings but this may be due to the elevated loads that are typically used when shooting 80 grain bullets at 600 yards. Hope this helped. Chad [/QUOTE]
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