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The Range
Rifle & Shotgun Discussion
Colt AR Bolt Cycling Issue
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<blockquote data-quote="uncle money bags" data-source="post: 2839729" data-attributes="member: 8377"><p>First, lets get the gaps in the gas rings myth out of the way. It doesnt matter where they are lined up.</p><p>The tightness between the bolt and BCG is normal and will wear itself in and become looser as time goes by. </p><p></p><p>Tula .223 ammo is weak, but it should still cycle. however, the Colt is designed around the 5.56 round which is a higher pressure and it is not uncommon for it to choke on lower pressure rounds until it has loosened up. Combined with using steel case ammo, which does not obturate like brass cased ammo allowing blow by which fouls the chamber and provides less gas to the system can cause this problem initially. To test this, take one of the BCG's from one of the other known good rifles and install it in the Colt and check function with live fire. If it works fine then it is just a matter of breaking in the Colt until it will work with lower pressure rounds consistently. In the mean time, pay particular attention to making sure the chamber is cleaned. The blow by from steel cased ammo leaves more residue in the chamber than brass cased and can cause malfunctions by retarding the extraction sequence. this is a particular problem if you switch to brass cased after shooting steel cased without cleaning the chamber. </p><p>Using cheap ammo has its positives and negatives, and attention to a cleaning regimen focused on keeping the chamber cleaned is one of the trade offs. </p><p>My recommendation is to shoot a couple hundred full power 5.56 rounds (M193 or M855) through a well lubed, spec AR before trying to shoot steel cased ammo. </p><p>To reiterate, more than likely this is not an issue with the rifle, and you have already tried separate magazines, so the issue is probably tighter tolerances which will work themselves out with use.</p></blockquote><p></p>
[QUOTE="uncle money bags, post: 2839729, member: 8377"] First, lets get the gaps in the gas rings myth out of the way. It doesnt matter where they are lined up. The tightness between the bolt and BCG is normal and will wear itself in and become looser as time goes by. Tula .223 ammo is weak, but it should still cycle. however, the Colt is designed around the 5.56 round which is a higher pressure and it is not uncommon for it to choke on lower pressure rounds until it has loosened up. Combined with using steel case ammo, which does not obturate like brass cased ammo allowing blow by which fouls the chamber and provides less gas to the system can cause this problem initially. To test this, take one of the BCG's from one of the other known good rifles and install it in the Colt and check function with live fire. If it works fine then it is just a matter of breaking in the Colt until it will work with lower pressure rounds consistently. In the mean time, pay particular attention to making sure the chamber is cleaned. The blow by from steel cased ammo leaves more residue in the chamber than brass cased and can cause malfunctions by retarding the extraction sequence. this is a particular problem if you switch to brass cased after shooting steel cased without cleaning the chamber. Using cheap ammo has its positives and negatives, and attention to a cleaning regimen focused on keeping the chamber cleaned is one of the trade offs. My recommendation is to shoot a couple hundred full power 5.56 rounds (M193 or M855) through a well lubed, spec AR before trying to shoot steel cased ammo. To reiterate, more than likely this is not an issue with the rifle, and you have already tried separate magazines, so the issue is probably tighter tolerances which will work themselves out with use. [/QUOTE]
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