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Rifles, Reloading, Optics, Equipment
AR15/10 Rifles
HK417 design fault
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<blockquote data-quote="willo" data-source="post: 890355" data-attributes="member: 74599"><p>The problem is easily rectified by cleaning the posts and accompanying springs however this requires special tools which most end users don't carry and is definitely not the maintenance you want to be carrying out in the field due to the chance of loosing a number of small components.</p><p></p><p>A full bolt strip is the only answer which means workshop attention. I can only imagine the ports are in place to allow for lubrication?? however due to the rapid build up of carbon on this part of the bolt, the ports and internal ejectors very quickly become constricted. First signs of the ejectors not functioning correctly are seen as expended rounds begin to fall closer to the ejection port and not the usual 1.5-2 meters at the 2 o'clock.</p><p></p><p>You notice on the attached the picture the expended cartridge has distinct linear carbon traces from the neck to case head. This is evidence of the grooves within the chamber which allows the excessive gas to be pushes back onto the front portion of the bolt group and upper receiver.</p><p></p><p>I've seen 20inch 417's with bolt units without the ports and as you say the 416's don't have the ports either. I have seen other AR's with this type of port however. Any idea as to the purpose of this design would be helpful and out of curiosity does your 416 have similar grooves in the chamber?</p></blockquote><p></p>
[QUOTE="willo, post: 890355, member: 74599"] The problem is easily rectified by cleaning the posts and accompanying springs however this requires special tools which most end users don't carry and is definitely not the maintenance you want to be carrying out in the field due to the chance of loosing a number of small components. A full bolt strip is the only answer which means workshop attention. I can only imagine the ports are in place to allow for lubrication?? however due to the rapid build up of carbon on this part of the bolt, the ports and internal ejectors very quickly become constricted. First signs of the ejectors not functioning correctly are seen as expended rounds begin to fall closer to the ejection port and not the usual 1.5-2 meters at the 2 o'clock. You notice on the attached the picture the expended cartridge has distinct linear carbon traces from the neck to case head. This is evidence of the grooves within the chamber which allows the excessive gas to be pushes back onto the front portion of the bolt group and upper receiver. I've seen 20inch 417's with bolt units without the ports and as you say the 416's don't have the ports either. I have seen other AR's with this type of port however. Any idea as to the purpose of this design would be helpful and out of curiosity does your 416 have similar grooves in the chamber? [/QUOTE]
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Rifles, Reloading, Optics, Equipment
AR15/10 Rifles
HK417 design fault
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