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Posted: 5/11/2002 2:39:50 PM EDT
i have been having all kinds of problems getting a 7.5 inch .223 upper to run 100% reliably. did everything.. m-4 extractor spring..heavy buffer ..enlarged gasport, d-ring..i talked with GREG LEAF @ ar15pigtail.com...ordered a pigtail gas tube..the gun is now 110% reliable  will fire and feed ANY ammo i put in it and extract and eject 100%...well worth the money
 john in houston
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