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Thread: AR not unlocking

  1. #21
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    Quote Originally Posted by SteveL View Post
    In the photos you posted above, the second one shows the setup from the bottom. Aren't those set screws I see?
    Yep, always nice to learn stuff that's right under your nose.

  2. #22
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    Quote Originally Posted by QuadBomb View Post
    It has rails because I ordered it that way. I wanted a rifle with an A-frame front sight base like my issue M4, but ARP doesn't seem to make those, or at least they didn't when I ordered it. I already had a rail-compatible screw-on fixed front sight, so I chose the railed gas block.

    I just talked on the phone to a local smith who said he can re-set the gas block and loctite the screws into place. Should I see if he can pin on a regular FSB instead?

    ETA: What is going on with this thread? The post by me at the top of this page was typed and posted after this post. Not Yesterday like it says. Weird!
    I would absolutely prefer a regular FSB pinned in place. It won't come loose, no loctite worries, would be more lightweight, and would be/look like your issue M4. Secondly, adding a sight to the current gas block would just create more leverage and bulk if it is accidentally knocked around a bit, increasing the likelihood of it coming loose again. A regular FSB is about 30 bucks plus install, well worth it in my opinion.

    Another good option is to have a steel lo pro gas block pinned on by your smith, and put a rail mounted front sight on your very nice quad rail hand-guard. This option would be more pricey because you would also have to buy a front sight.

    Yeah, several of the threads are being very weird, changing the order of posts around. The threads need to be locktited Good luck with your decisions!

  3. #23
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    No offense, but that gas block gives me the heebejeebies. It appears to be leaking a lot. The two set screws on the bottom don't even look like screws, kinda hard to tell in the picture. If it is made of aluminum, that is not ideal and may explain it loosening up. Why is it so huge and why does it have rails? If it were me, I would try and have it professionally replaced with something more sturdy and pinned on there.

  4. #24
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    Quote Originally Posted by P2000 View Post
    No offense, but that gas block gives me the heebejeebies. It appears to be leaking a lot. The two set screws on the bottom don't even look like screws, kinda hard to tell in the picture. If it is made of aluminum, that is not ideal and may explain it loosening up. Why is it so huge and why does it have rails? If it were me, I would try and have it professionally replaced with something more sturdy and pinned on there.
    It has rails because I ordered it that way. I wanted a rifle with an A-frame front sight base like my issue M4, but ARP doesn't seem to make those, or at least they didn't when I ordered it. I already had a rail-compatible screw-on fixed front sight, so I chose the railed gas block.

    I just talked on the phone to a local smith who said he can re-set the gas block and loctite the screws into place. Should I see if he can pin on a regular FSB instead?

    ETA: What is going on with this thread? The post by me at the top of this page was typed and posted after this post. Not Yesterday like it says. Weird!

  5. #25
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    Quote Originally Posted by P2000 View Post
    I would absolutely prefer a regular FSB pinned in place. It won't come loose, no loctite worries, would be more lightweight, and would be/look like your issue M4. Secondly, adding a sight to the current gas block would just create more leverage and bulk if it is accidentally knocked around a bit, increasing the likelihood of it coming loose again. A regular FSB is about 30 bucks plus install, well worth it in my opinion.
    If I were to go this route, would there be any considerations with regard to the gas port size of the 6.8 vs a regular 5.56 FSB? Just trying to cover every detail here. I want the rifle to cycle most types of 6.8 ammo.

  6. #26
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    Quote Originally Posted by QuadBomb View Post
    If I were to go this route, would there be any considerations with regard to the gas port size of the 6.8 vs a regular 5.56 FSB? Just trying to cover every detail here. I want the rifle to cycle most types of 6.8 ammo.
    Good question, no worries. 6.8 and 5.56 barrels use the same gas blocks or FSB's. They are designed to accommodate a wide range of gas port sizes. The only concern is if your smith can properly pin a FSB. I'm not sure if it is something every smith can do.

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