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  #1  
Old 04-18-2011, 6:50 PM
wizdumb wizdumb is offline
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Default Gas block taper pin stuck on S&W M&P-15 (AR-15)

I've been hammering away with a punch to try and remove the taper pin on my railed gas block, but it won't budge.

Here's kind of what it looks like, though they appear to have updated since last year.


Heck, I can't even seem to get the gas tube roll pin to come out.

It looks like this fella has the same issue:
http://smith-wessonforum.com/s-w-smi...-m-p-15-a.html

Is this a problem for just the S&W's or all AR-15s?

Should I try a vise/heat/kroil, as suggested in that forum link?
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Old 04-24-2011, 8:23 AM
wizdumb wizdumb is offline
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Still no one?

I managed to get the gas block roll pin removed, but the taper pin is still stuck.

I've tried a variety of punches and hammers, Kroil, and yesterday I tried an arbor press. Still won't budge.
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Old 04-24-2011, 9:57 AM
wizdumb wizdumb is offline
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No wonder. I just measured both sides of the taper pin, apparently S&W decided that the standard way to install taper pins wasn't good enough for them, because theirs need to drift right to left to be removed. Ridiculous.
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Old 05-01-2011, 7:31 PM
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Update: I finally was able to remove this taper pin. I soaked it overnight in Kroil, then tapped it out with a concave punch (from Brownells) and a nice smack from a heavy STEEL hammer.
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Old 05-01-2011, 7:37 PM
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Peter.Steele Peter.Steele is offline
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Quote:
Originally Posted by wizdumb View Post
No wonder. I just measured both sides of the taper pin, apparently S&W decided that the standard way to install taper pins wasn't good enough for them, because theirs need to drift right to left to be removed. Ridiculous.



Dude, pretty sure that all AR-15 FSB / gas block pins are directional, not just S&W's.
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Old 05-06-2011, 8:26 AM
wizdumb wizdumb is offline
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That's not what I meant. Yes, they are all directional, but "usually" you remove them from left to right. Brownells even sells a front sight gas block that's labelled Pins Out, Pins In, depending on which side is up. For the S&W rifle, that product's instructions would be incorrect.
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Old 05-06-2011, 8:49 AM
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I've found that a little bit of heat from a heat gun and soaking it in PB Blast usually helps loosen these pins. Tightness is fairly common, and that's actually a good thing - they wont come out unless you REALLY want them to.

Still, kind of messed up that they reversed the direction of the pins on the S&W. Left to right to remove is the standard, and there's really no reason to reverse it.
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