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Posted: 3/3/2015 1:25:34 AM EDT
[#1]
It's needed because most of the time, the shoulder on a barrel is cut to allow space for a handguard ring. That's what that shoulder is really there for, is to retain a handguard ring in a traditional configuration. It's more like .040 or .045 I think.
Some barrels are not cut that way, and some gas blocks are made larger to compensate for that, so it's not a 100% ironclad rule. You have to see how your particular barrel and gas block are made. |
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Posted: 3/3/2015 2:38:06 AM EDT
[#2]
if it's a set screw type gas block. you can easily check by removing the set screws and install it on the barrel and rotate it upside-down, centering the screw hole over the gas port in the barrel. since they drill the hole in the gas block through the set screw hole. you will be able to determine it's proper position this way.
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Posted: 3/3/2015 7:35:40 AM EDT
[#3]
Quote HistoryQuoted:
It's needed because most of the time, the shoulder on a barrel is cut to allow space for a handguard ring. That's what that shoulder is really there for, is to retain a handguard ring in a traditional configuration. This. My 1st build, I pushed the gas block against the shoulder and tightened the set screws. The rifle had short stroking issues. Loosened the gas block set screws, and used a steel ruler as a spacer between the gas block and shoulder, re-tighten set screws. No short stroke problems. |
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Posted: 3/3/2015 7:47:09 AM EDT
[#4]
Handguard cap spacer....I use an old one as a gap gauge to male sure its spaced correctly
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Posted: 3/3/2015 9:34:27 AM EDT
[#5]
Quote HistoryQuoted:
Handguard cap spacer....I use an old one as a gap gauge to male sure its spaced correctly This. Get an old handguard cap from a gun show or LGS and cut it in half. Use this as a spacer as JMO stated. |
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Posted: 3/3/2015 11:34:37 AM EDT
[#6]
Depends what gas block you get. Some require a gap while others go against the shoulder. I have a YHM that goes against the shoulder. Their website even states so.
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Posted: 3/3/2015 7:01:03 PM EDT
[#7]
The easy way to tell, just put the bottom of the block against the top of the barrel against the barrel should and see where the center of the back set screw channel aligns with the gas port on the barrel.
As stated, the back set screw channel on the block is also used to produce the gas block channel in the receiver, so where the center of the block thread channel aligns to the gas port, is where the block should align to the barrel. Also to point out, if the barrel is dimpled, then what should have happened is the dimple is dead center below the gas port on the barrel. So forget about any front dimple towards the muzzle if your barrel is dimpled front and back, and make sure that the set screw on the back of the block is mated to the dimple closest to the barrel shoulder its installed. |
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