FTE issues

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  • cap6888

    Ultimate Member
    Oct 2, 2011
    2,561
    Howard County
    So I had a nice range day today with my daughter. She put about 100 rounds down range through the trusty Marlin 795. Very nice groupings for a 15 year old using irons. Especially since I only get her out maybe 3-4 times a year.

    But I digress. My issue today was with a new Andro Corp 10.5 upper/SBR. I went to the range a few weeks ago, and it ran like a champ. No issues at all. Today I had 4 (maybe 5) FTE issues. One off which I had to mortar out, and all others needed to be forced out with a cleaning rod. And not a little love tap. I mean really hammered out. I have been shooting steel case Wolf for years with no issues. As a matter of fact, that is the only ammo that I had used previously in this gun. After I cleared the first several jambs, it would run for a few rounds, then FTE again. After I had to mortar the round out, I shut it down for the day. The casings didn't look to have any issues at all. the only round I actually saved was the mortared out one, but it doesn't look messed up in any way. Obviously a intense cleaning, and liberal lubrication is on deck. Aside from that any thoughts?

    On a separate note, I have a Century M85 NPAP that I can't sight in to save my life. I am able to boresight it at home (only at 10 yards, space is limited), but I figure that should just give me elevation issues. I can;t even get on paper at 50 yards. Help!?!?!?!?!
     

    outrider58

    Eats Bacon Raw
    MDS Supporter
    Jul 29, 2014
    50,043
    Could be the chamber just needs a good scrubbing with a nylon brush and some carbon solvent. Assuming you were shooting brass cased ammo this time?

    For the M-85, if you have a nice dirt berm to shoot into, with the gun in a solid rest, aim at a spot on the berm. Just before the shot, pick your head up carefully and watch the berm for the hit. That should help pin down where your rounds are hitting. Do this at 25-50 yds. No further away. You need to be able to see the dirt kick up.
     

    outrider58

    Eats Bacon Raw
    MDS Supporter
    Jul 29, 2014
    50,043
    Thanks. Been using steel cased the whole time. Hopefully a good cleaning foxes the issue.

    Make sure your extractor is nice and sharp. Remove it from the bolt, clean it, then drag it across you shin(claw side down). If it doesn't leave two distinct scratch marks on your skin, it might be time to replace it. Steel cases are harder on extractors than brass.
     

    John from MD

    American Patriot
    MDS Supporter
    May 12, 2005
    22,948
    Socialist State of Maryland
    Are you now using a brand of steel that uses a lacquer coating? If so, it will build up in the chamber. Acetone and 0000 steel wool spun with a battery powered drill makes short work of it. It will also take the carbon out. A nylon brush is good for sweeping out unburned powder granules but doesn't do much with deposits.
     

    cap6888

    Ultimate Member
    Oct 2, 2011
    2,561
    Howard County
    just for the record, you were shooting the same ammo this time as the previous times?

    Yes. I gave it a nice cleaning today, but it was still pretty clean since I only had about 150 rounds through it. Nothing looked amiss to my untrained eye. I checked the extractor like Outrider said, it looked ok too. Maybe week after next I will get back to the range to give it another go.
     

    Digby

    Member
    Feb 19, 2014
    37
    Western Howard County
    AR SBR's are more prone to these sorts of issues than carbine or rifle length ARs. It's probably a dirty chamber as others have pointed out, but since you are also looking at the extractor as a possible trouble source, check the configuration of the extractor spring. Gold colored springs are extra-strength while silver colored ones are not. Is there a solid block of material inserted in the center of the extractor spring? This block increases spring tension. How about an o-ring around the spring? The o-ring also increases spring tension. You can replace the spring with an extra-strength one with the block inserted in between the coils, and/or buy a pack of O-rings for a few bucks that slip over the extractor spring. Many sources sell these parts for under $5. See, for example this: https://www.bravocompanyusa.com/BCM-Extractor-Spring-Uprade-Kit-p/bcm-exspring-1.htm
     

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