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Posted: 12/18/2016 6:58:39 PM EDT
[#1]
Just use channel lock pliers.
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Posted: 12/18/2016 6:59:45 PM EDT
[#2]
did you lube it a little and use a roll pin punch?,I switched to coiled roll pins along time ago,sometimes beveling them a bit and chase the hole in the gas block with a drill bit first by hand to clear out any burrs in there,to me the hardest is lining it up and sinking it
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Posted: 12/18/2016 7:00:28 PM EDT
[#3]
Are you sure the gas tube is inserted all the way and the holes are aligned.
I normally use a punch to ensure alignment before driving the roll pin. |
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Posted: 12/18/2016 7:02:15 PM EDT
[#4]
Bevel pin, hold it with needle nose, and whack it
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Posted: 12/18/2016 7:04:47 PM EDT
[#5]
Quote HistoryQuoted:
Are you sure the gas tube is inserted all the way and the holes are aligned. I normally use a punch to ensure alignment before driving the roll pin. That might be the issue. There are metal shavings in the bottom of the hole in the block where the tube goes in. I had to magnetize a punch several times to dig most of the shavings out. Perhaps there are still some in there causing a slight misalignment with the hole in the tube. |
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Posted: 12/18/2016 7:08:38 PM EDT
[#6]
Just knocked the pin out. The inside of the pin is clogged with metal shavings.
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Posted: 12/18/2016 7:10:13 PM EDT
[#7]
Try blowing it out with a compressor or canned air.
You may need to clear the chips with a drill bit, just spin it in the hole with your fingers. |
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Posted: 12/18/2016 7:24:14 PM EDT
[#8]
Finally got it. I wasn't expecting this to be the toughest part of building an AR.
http://imgur.com/a/t5tF2 I took the pin out, and the tube was fused into the gas block. I blew out the hole and scraped around in there as suggested. Then I tapped on the end of the tube with a plastic hammer to seat it in there as well as possible. The pin finally went in... enough. |
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Posted: 12/18/2016 7:33:24 PM EDT
[#9]
Good job.
Next time, closely inspect the holes you are sticking stuff into. 
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Posted: 12/18/2016 7:39:03 PM EDT
[#10]
lesson learned,do this on a lower if you assemble yourself ( chasing the holes) glad it worked out for you
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Posted: 12/18/2016 7:46:26 PM EDT
[#11]
I've found more gas tube size roll pins out of spec than any other size (too large of diameter)
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Posted: 12/18/2016 8:13:43 PM EDT
[#12]
Quote HistoryQuoted:
Are you sure the gas tube is inserted all the way and the holes are aligned. I normally use a punch to ensure alignment before driving the roll pin. I do this followed by putting a couple of rubber bands around barrel and gas tube to freeze everything in place as I drive the pin in. I bought a metric ton of stainless properly sized roll pins from McMaster-Carr and they are a one shot 100% success rate performer. No more bent, flowered pins needing being redone. Every single pin I ever got with a block or tube (even with bulk buys) have mostly been crap and get thrown into the recycle bin. |
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Posted: 12/18/2016 11:12:56 PM EDT
[#13]
Quote HistoryQuoted:
I do this followed by putting a couple of rubber bands around barrel and gas tube to freeze everything in place as I drive the pin in. I bought a metric ton of stainless properly sized roll pins from McMaster-Carr and they are a one shot 100% success rate performer. No more bent, flowered pins needing being redone. Every single pin I ever got with a block or tube (even with bulk buys) have mostly been crap and get thrown into the recycle bin. Got a part number for those McMaster-Carr roll pins? |
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Posted: 12/18/2016 11:39:59 PM EDT
[#14]
Thanks all.
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Posted: 12/19/2016 2:10:45 PM EDT
[#15]
Quote HistoryQuoted:
Got a part number for those McMaster-Carr roll pins? 92373A120 in 18-8 stainless. $5.19 for 100. 
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