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Posted: 2/5/2005 5:55:25 PM EDT
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I finally got out to the range today. I replaced the extractor and this is the first chance I've had to shoot this rifle. I fired one round from a good mag (O-Kay) and the bolt held open. I did this test half a dozen times. So this rifle is not short stroking. So I fired a bunch of rounds fast as possible and it reproduced the jammo-matic problem. Empty round flipped backwards and jammed between the bolt and the top of the receiver and the fresh round half way to the chamber. After I cleared the jam, I slow fired about 100 rounds with NO JAMS! Damn, when this rifle works, it is the shiznit to shoot. Very accurate and fun. |
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Pull the extractor and clean the end channel burrs off the ammo rim groove, and any burs off the grabbing side of the claw (use a small jeweler's file). Check the pin hole/ sides of the extractor for burs that may be binding the extractor in the bolt extractor channel/cut. Again, the file is your friend, and it just begging to be used. Add a #60 O ring around the extractor spring to add tension to the extractor to assist it in retain pressure on the rim of the spent case and put the thing back in the rifle. Lube the upper bearing surfaces with a good coat of CLP, and go buck wild shooting the running rifle. |
Sounds like your ejector is definately over-powering your extractor. This causes the extractor to let loose of the empty casing too soon. One solution as Dano523 said is an O-ring. Another is a 'D-Fender' ring or a stronger extractor spring like a Wolff XP M4 extractor spring. I even use Wolffs in 20" uppers as it makes them eject slightly forward which where I shoot (the NRA Range in FFX VA) makes clean up much easier!  Since all you have to do is sweep the brass down range instead of picking it up.
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Do not use an O ring in conjunction with a Wolff HD extractor spring. I have had very good results with both the Wolff springs and the HD springs available from SAW in my 14.5" barrels. I only use Colt bolts. |
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