PS90 barrel stuck (SBR conversion)

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Thread: PS90 barrel stuck (SBR conversion)

  1. #1
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    PS90 barrel stuck (SBR conversion)

    Hello,

    I recently acquired an OD green PS90 with factory black ring sight and immediately stamped it. Stamp was approved a few days ago, and I'm trying to remove the barrel, but it is absolutely ****ing seized.

    I've removed the blind pin
    I've thinned a 15mm wrench
    The upper is in a vice
    I am turning clockwise

    I'm applying my entire body weight to this thing and all it's doing is slipping the upper out of the vice. There is a pretty big mar being formed on the receiver above the flat part of the barrel shroud where it is twisting into the receiver.

    Is there loctite or something on this? I know that I have an older model PS90, these were discontinued in like 2012, so my assumption is that maybe fouling has seized up the threads. Does anyone have any suggestions? My only thoughts are a bigger, stronger vice and a breaker bar, but I think if I clamped it any tighter it'd absolutely ruin the finish on the upper.

    Did they use a loctite on it as well? Do you think hitting it with my propane torch would help at all?
    Last edited by lemonysword; 05-18-2020 at 10:04 AM.


  2. #2
    Senior Member akitainu's Avatar
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    I'd hit it with some PB Blaster (or something similar) and let it sit a bit.

    Good luck, man. I took the easy route and took a band saw to mine.

    You may want to take a look at this:
    PS90 Barrel Swap (How To W/Pics)
    Last edited by akitainu; 05-18-2020 at 10:14 AM.
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    The threads, so far as I understand, are kinda deep inside the barrel shroud so I don't know how I'd get PB blaster or another penetrating oil to it. The only thing that thread tells me at the stage I am at is to turn the wrench clockwise, which I am doing.

    If you hacksaw it past the threads, there shouldn't really be anything holding it on right? The barrel should just slide right out?

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    Senior Member akitainu's Avatar
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    Quote Originally Posted by lemonysword View Post
    If you hacksaw it past the threads, there shouldn't really be anything holding it on right? The barrel should just slide right out?
    Mine dropped right out after cutting it. I was going to get the barrel cut and threaded as a spare anyways, so I saw no need to go through the extra steps.
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    You've made the call easy then. Just mad I wasted $5 and a bunch of time on a sacrificial 15mm wrench

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    Senior Member akitainu's Avatar
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    I'm sure some one may still chime in with an idea to free it, lot's of folks have gone your route with success. Plus, you'll still need the wrench to install the new barrel.
    Last edited by akitainu; 05-18-2020 at 10:37 AM.
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    Iím guessing you donít have the blind pin fully drilled out!
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    Unless the blind pin is completley removed, it can jam the shroud while trying to remove it. Even the smallest of pin left can jam the threads. And you will need the thinned wrench to torque the SB to the front adapter.
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    Quote Originally Posted by LESTER View Post
    Iím guessing you donít have the blind pin fully drilled out!
    I drilled behind it and punched it out from the back, so I assure you it is completely gone. In any case, I took the easy route like Akitainu did and spent 10 minutes with the hacksaw. Barrel just fell out. I think drilling and punching the pin is only for people who, for some inexplicable reason, want to replace the dumb 16" flash hider with another dumb 16" flash hider/brake. I went with Class 3 Machining for the cut after hearing several good reviews about him.

    Attachment 134663

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    One of those parts on the barrel is reverse threaded

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