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Posted: 8/4/2007 4:09:22 PM EDT
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I have a Colt LE Carbine. After about 6 to 8 rounds, it will have a FTF. I have tried two mags. One is a used Colt, the other a new Brownells 20rd. The bolt will stop about half way and the round will not chamber. The round is clear of the magazine and has started going in to the chamber. I can not move the bolt forward using the forward assist. Looking at the round after it is taken out of the chamber, you can see where it now has a small dent about half way down. The ammo is Fed .223 and Military LC .223. If you have any information that would help, please let me know. Thanks. |
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You’re getting bolt over at the feed. This is the bolt grabbing the case not at the back of the rim, but at the middle of the case after the rim. This could be a new mag problem, or a short stroking problem. Best suggestion is to pull the mags apart to check the bottom of the feed lips for burs, clean them, and even break in the followers to the mag body by hand if needed. As for the rifle, going to guess, but chances are you are not correctly lubing the upper bearing areas with CLP. P.S. Welcome to the site!!! |
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Thank you for the information. I need to give a little more detal. On the type of FTF I'm having, the bolt is behind the round. It does not appear that the bolt is grabbing the case in the middle. The round has not entered the chamber all the way and the marks on the round appear to be comming from the round trying to enter the chamber. Would this also be a short stroking problem? Thanks again. |
Could be, are you removing/flushing all the copper cleaning solvent from the bore/chamber after cleaning, and lubing the upper bearing surface of the rifle with CLP? If you are, then pull the B/C and check the firing pin collar. The outer diameter of the firing pin collar should be flush or just below the ramp on the carrier when pressed against the back of the carrier (still in the bolt). Also, check the upper receiver just below the feed ramps of the barrel. If the front of the upper has bullet tip low feed dents/marks, then you’re back at short stroke problems (guessing lack of correct cleaning/lubing methods for break in). |
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