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Posted: 12/28/2011 2:31:06 PM EDT
so i received my new Ranier arms barrel in today and i have a YHM low profile gas block sitting here. the barrel is exactly .750 but the gas block is .747 now my question is what should i do to get it on? do i sand down the barrel or should i sand the inside of the gas block. thank you.
Link Posted: 12/28/2011 2:35:56 PM EDT
I had the same barrel and block as you have. I first tried to sand the block but it was still too tight so I ordered a block that was slotted.
Link Posted: 12/28/2011 2:36:44 PM EDT
Return to YHM & have them send you the proper size gas block. I take it the .747 is your measurement? You could try sanding but make sure it doesn't fit first.
Link Posted: 12/28/2011 3:11:41 PM EDT
i tried to get it to fit and there's no way its going to slide on i put oil on both but didn't budge.
Link Posted: 12/28/2011 3:12:15 PM EDT
and yes .747 is what my digital micrometer says.
Link Posted: 12/28/2011 3:27:32 PM EDT
send it back to yhm. If they can't get you one that wil fit try a Vltor... have used 3 or 4 of those and they always fit at least mine have.
Link Posted: 12/28/2011 11:04:54 PM EDT
You could send it back or heat the sucker up, you might be able to get the 3 thousands out of it. I have a straight reamer in my toolbox at work but that isn't doing you any good, lol.
Link Posted: 12/29/2011 5:17:56 AM EDT
Whatever you do with sanding, please sand the cheaper of the two items. You could take it to a local machine shop, and they can mill it.

Best bet. Send it back and get a new one.
Link Posted: 12/29/2011 11:30:06 AM EDT
I would think YHM will make it right.
If you are in a hurry you could try a wheel cylinder hone.
Link Posted: 12/29/2011 12:04:35 PM EDT
You just don't want to sand the barrel because then replacement blocks will always be loose.
Link Posted: 12/29/2011 12:39:10 PM EDT
[Last Edit: 12/29/2011 12:45:32 PM EDT by comp1911]
Brake cylinder hone

http://www.mcmaster.com/#cylinder-hones/=fkt9gt

Don't touch the barrel.

Rainier also makes a gas block that is specically designed for thier barrels.
Link Posted: 12/30/2011 6:38:39 AM EDT
.003" isn't much. Can you try freezing the barrel and heating the gas block? It might be worth a shot before sanding, grinding or returning things. What does YHM say? They may have encountered this before and have an easy fix.
Link Posted: 12/30/2011 7:22:18 AM EDT
Originally Posted By NickySantoro:
.003" isn't much. Can you try freezing the barrel and heating the gas block? It might be worth a shot before sanding, grinding or returning things. What does YHM say? They may have encountered this before and have an easy fix.


+1 Freeze barrel over night. I would put it in a ziploc bag to prevent moisture. Or heat the gasblock in the oven for a bit. You shouldn't have to do both. Work fast and make sure it is lined up correctly the first time
Link Posted: 12/30/2011 8:25:16 AM EDT
Originally Posted By Espos1111:
Originally Posted By NickySantoro:
.003" isn't much. Can you try freezing the barrel and heating the gas block? It might be worth a shot before sanding, grinding or returning things. What does YHM say? They may have encountered this before and have an easy fix.


+1 Freeze barrel over night. I would put it in a ziploc bag to prevent moisture. Or heat the gasblock in the oven for a bit. You shouldn't have to do both. Work fast and make sure it is lined up correctly the first time


No reason why this wouldn't work.
Link Posted: 12/30/2011 9:32:27 AM EDT
I couldn't get my Troy gas block to fit so I used a medium butane torch and it went on with some force. Now it will come on and off easily when i loosen the set screws... Not sure what has changed haha...

Don't forget to put a light coat of oil on the barrel so you don't scratch it. It also helps to slide it on the seat.
Link Posted: 12/30/2011 9:47:53 AM EDT
Heat it up. Had similar issue with a Larue lopro gas block on my GTS 6.8 barrel. heated it up with a torch while holding it with channel locks. Once good and heated, it slid right on and locked up tight.

Make sure it's aligned correctly when you put it on because it will cool and clamp on quickly
Link Posted: 12/30/2011 9:51:54 AM EDT
seems like a bad idea to force the two together with heat/cold whatever. If you ever want to remove the GB you are hosed. I would get a good fitting GB and be done with it, knowing I can remove anytime I wanted.
Link Posted: 12/30/2011 10:11:52 AM EDT
3 thou is a lot at only 3/4"
Link Posted: 12/30/2011 12:59:49 PM EDT
thanks guys for the fast responses and great ideas. i went ahead and ordered the gas block from raniers. and im going to go ahead and use the YHM gas block on a government profile barrel that it just slides right on to.
Link Posted: 12/30/2011 3:01:58 PM EDT
Originally Posted By comp1911:
Brake cylinder hone

http://www.mcmaster.com/#cylinder-hones/=fkt9gt

Don't touch the barrel.

Rainier also makes a gas block that is specically designed for thier barrels.


+1. A 3-stone brake cylinder hone will work just fine.
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