mac66,
I would trade out the pigtail tube for standard. The pigtail will be doing the opposite of what you want. It is slowing the ejection. I could be wrong about that, but from what I understand the pigtail delays the gas operation. It was good for 7.5" AR15 barrels, but I'm not sure it a good idea for the 300 Whisper. Can anyone else provide info on the pigtail.
My understanding of the pigtail was that the bolt on 7.5" was either tearing away cases because there wasn't enough time before the case was being ripped from the chamber or it was sending it back too violently and ripping the cases.
Someone with an understanding or experience with this chime in.
Who's 300 do you have? Is it also a Model 1?
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Originally Posted by mac66
Hello all-- I too have had ongoing problems with my .300 whisper. It is an AR-15 w/ a 16" barrel with the gas port in the carbine position. I first purchased a JP adjustable gas block and a "Pigtail" gas tube. It will now eject the empty (supersonic) and, about 50% of the time, chamber a new round. Subsonic rounds smokestack and/or fail to feed. After reading the above posts, I have been looking at the gas port diameter and will open it up to .125 this week. I also polished the chamber with my Dremel and Flitz to reduce any friction that may be contributing to the problem. I'll try to test fire this week. Thanks for the ideas.
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