am2fan 0 Posted April 6, 2011 Report Share Posted April 6, 2011 I searched archives but didn't find the answer or at least I didn't see it anywhere. I must have gotten in a hurry when removing gas block because I lost my witness mark ( I guess I didn't scribe deep enough) when re-installing after drilling ports and polishing. I think I have it aligned - got the bottom pin re-installed but had to wrap it pretty sharply with hammer and finish with drive pin punch. Is this normal? Is it possible to drive the pins in and not be aligned with the barrel pin slots? Don't want to mess this up - I'm ready to be done with the work and go shoot! Thanks Quote Link to post Share on other sites
TwentyNizzo 66 Posted April 6, 2011 Report Share Posted April 6, 2011 You're good. The bottom pin should be quite tight - at least it was on mine. If you got the pins in, it's aligned. Quote Link to post Share on other sites
Cobra 76 two 2,677 Posted April 6, 2011 Report Share Posted April 6, 2011 Is it straight? Are your ports all uncovered? If so them that's what you want. They are not necessarily right as received. 1 Quote Link to post Share on other sites
am2fan 0 Posted April 12, 2011 Author Report Share Posted April 12, 2011 Yes - seems to be straight, ports drilled to .093 and all visible/uncovered now. Gas block polished, opening slightly enlarged. Got it back together. How about polishing burrs out of barrel where ports were enlarged? Best way? Thanks for the help Quote Link to post Share on other sites
csmw 98 Posted April 12, 2011 Report Share Posted April 12, 2011 If your pins went in straight and the gas holes are unobstructed, you are good to go Quote Link to post Share on other sites
Paulyski 2,227 Posted April 12, 2011 Report Share Posted April 12, 2011 When preforming this procedure I advise people to scribe a cross mark at & on the rear of the block so realignment goes smooth. I say at the rear so they can't scratch it of while drifting the block. Quote Link to post Share on other sites
csmw 98 Posted April 12, 2011 Report Share Posted April 12, 2011 You can also shine a flashlight through the pin holes to see where the alignment is and adjust from there. When it's a straight shot, nail the pins in. Quote Link to post Share on other sites
Spartacus 1,619 Posted April 12, 2011 Report Share Posted April 12, 2011 You can also shine a flashlight through the pin holes to see where the alignment is and adjust from there. When it's a straight shot, nail the pins in. +1 Yep, that's what I did. You eyeball it to get it close and then look through the pin holes with the flashlight and use light taps with a rubber mallet to get 'er lined up like the factory had it. Quote Link to post Share on other sites
csmw 98 Posted April 12, 2011 Report Share Posted April 12, 2011 You can also shine a flashlight through the pin holes to see where the alignment is and adjust from there. When it's a straight shot, nail the pins in. +1 Yep, that's what I did. You eyeball it to get it close and then look through the pin holes with the flashlight and use light taps with a rubber mallet to get 'er lined up like the factory had it. That's the only way to get it 100% lined up before you drive the pin in. Scribing only gets you close. Quote Link to post Share on other sites
Cobra 76 two 2,677 Posted April 12, 2011 Report Share Posted April 12, 2011 It's not always right the way the factory had it, so I just put a dual dimple in the back, right at the barrel and GB and on the casting line...and put a light scribe on the back edge with a razor knife, and note whether or not it's canted from the factory, before taking it off. Going back on, just get it as close as you can to 12:00 (no cant), with the pin holes lined up, and the gas tube good and tight. If you do the hole in the gas block correctly and the ports correctly, that should be good. It's actually not even hard to readjust the way it's clocked on the barrel, even after the pins are installed. There's a slight bit of room for movement. Quote Link to post Share on other sites
ten 1 Posted February 19, 2015 Report Share Posted February 19, 2015 i actually used weavers magnetic scope levels to help with the gas block cant. finding flat planes on receiver and gas block. used a mallet and punch to to work it in. and used a light to find gas ports as others mentioned. i was worried about burrs in the barrel as well. didnt really see any so i just ran a bore snake though it just encase. 1 Quote Link to post Share on other sites
gunfun 3,931 Posted February 19, 2015 Report Share Posted February 19, 2015 Some people try to hone in case of burrs. I wouldn't. I'd rather leave the chrome alone. Pushing a tornado brush through worked fine for me. Quote Link to post Share on other sites
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