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AR15 Disconnector Problem

AzAfshinAzAfshin Member Posts: 2,985 ✭✭
edited August 2017 in General Discussion
So I built a 556 AR based on a lower I bought pre-election [8D] I put a standard AR Stoner Enhanced trigger in there. As expected the trigger draw was very gritty and heavy. So I took out the FCG and polished all the contact points. That took care of the gritty feel, and as I expected, didn't lower the trigger weight any. I wasn't trying to reduce the trigger weight, just make it smoother. Did a function test and everything checked out until I went to the range.

No, it didn't go full auto. It did something I didn't expect. When I pulled the trigger it went bang once and ready for the next shot. If I let go of the trigger (to reset) fast, then no problem. But if I released the trigger slowly, instead of resetting, it would fire a shot and then be ready for the next shot. I googled the problem and the most common feedback was that the pin holes may be too far apart so when the disconnector releases the hammer, the sear doesn't catch it in time.

So I was resigned to having to buy an expensive trigger that came already assembled and just drop it in. Well, I slept on it and came up with a solution. I ground the front part of the disconnector (where it sits on the trigger) down to increase the amount of forward rotation of the disconnector, increasing the amount of time the hammer was held by the disconnector before releasing the hammer. Worked out to about 100th of an inch of removal, but now it works no matter how slowly I release the trigger.

However, I have a question for you guys. Before I take it to the range, do you guys foresee any other issues with my fix that I should look into now?
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Comments

  • Ricci WrightRicci Wright Member Posts: 8,259 ✭✭
    edited November -1
    Sounds like you know what you're doing. My only question is was this a surface hardened part like a S&W hammer and if so have you removed that hardening so it will wear prematurely.
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  • mogley98mogley98 Member Posts: 18,291 ✭✭✭✭
    edited November -1
    Maybe by taking it apart and reassembling it you fixed it. It is a menace now send it to my FFL and I will see to it that it never hurts anyone [:D][}:)]
    Why don't we go to school and work on the weekends and take the week off!
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  • chiefrchiefr Member Posts: 14,115 ✭✭✭✭
    edited November -1
    As long as the disconnector spring is installed correctly, sounds good to me.

    I have seen my share of issues caused by a offset, flat, bent. and weak disconnector springs, to include full auto.

    Drop-ins are cool and solve your problem in its entirety.
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  • AzAfshinAzAfshin Member Posts: 2,985 ✭✭
    edited November -1
    Ricci, usually the only surface hardened parts are the engagement parts on the sear and hammer, so I'm pretty sure this wasn't a surface hardened piece. I am worried about rusting though since the disconnector had a black coating that I removed. Aside from that, the contact surface between the disconnector and trigger is pretty large and not under a lot of pressure.

    Mogley, I actually did take it apart and put it back together several times hoping that would fix it, but it didn't. But now that it's a menace I have no choice but to send it to you for "disposal" [:D][:p]

    Chiefr, I double and triple checked the spring. It's working perfectly. It is possible that it was under powered and not holding the disconnector in position long enough, but very hard to check for that with a two piece FCG when inside the gun.
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  • 1911a1-fan1911a1-fan Member Posts: 51,193 ✭✭
    edited November -1
    man they are charging 400.00 for a binary trigger and you had one for free [:D]

    https://www.franklinarmory.com/products/binary-firing-system-gen-iii-trigger-pack
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  • AzAfshinAzAfshin Member Posts: 2,985 ✭✭
    edited November -1
    quote:Originally posted by 1911a1-fan
    man they are charging 400.00 for a binary trigger and you had one for free [:D]

    https://www.franklinarmory.com/products/binary-firing-system-gen-iii-trigger-pack



    I was thinking the exact same thing [:D] But now I know how to convert a trigger to a binary system.
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  • buddybbuddyb Member Posts: 5,393 ✭✭✭✭
    edited November -1
    One of the first ARs I built,put 10 rounds in the mag to test fire it,pulled the trigger and what I saw was a steady stream of brass coming out of the ejection port.Full auto due to a bad disconnector.
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  • MobuckMobuck Member Posts: 14,163 ✭✭✭✭
    edited November -1
    "However, I have a question for you guys. Before I take it to the range, do you guys foresee any other issues with my fix that I should look into now?"

    Throw away all the parts you ground, polished, or otherwise diddled with and start over with an ALG QMS or PSA enhanced fire control group.
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  • MobuckMobuck Member Posts: 14,163 ✭✭✭✭
    edited November -1
    "One of the first ARs I built,put 10 rounds in the mag to test fire it,pulled the trigger and what I saw was a steady stream of brass coming out of the ejection port.Full auto due to a bad disconnector."

    General rule of thumb is never put more than one round in the mag until you've proven the FCG works properly.
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