AR15 gas block front sight. - Graybeard Outdoors
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post #1 of 20 (permalink) Old 04-14-2017, 01:28 PM Thread Starter
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Default AR15 gas block front sight.

Has any one cut the front sight off the gas block to accommodate a long after market hand guard?

ch

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post #2 of 20 (permalink) Old 04-14-2017, 03:56 PM
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Default AR15 gas block front sight.

It would be better to use what is called an extended handguard. It accomodates tall gas blocks or sights.

http://www.midwayusa.com/product/101...aluminum-matte
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post #3 of 20 (permalink) Old 04-14-2017, 04:40 PM
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I've done it back before different gas blocks were readily available. The handguard style linked above will allow you to keep the fixed front sight. A low profile gas block that will fit under a longer handguard are fairly cheap. A tip for installing them is to remove the rear setscrew hole and then center that hole over the gas block. Then take a feeler gauge and measure the gap between the block and the step in the barrel. That will let you know how far from the barrel step to place the block.
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post #4 of 20 (permalink) Old 04-15-2017, 07:31 AM
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If you take your time and do a neat job of it, there's nothing wrong with trimming down an a2 front sight to make a poor mans low-profile gas block. As mentioned before, it's not the most asthetic option, so it's probably best reserved for use with a free float tube that will completely cover it. There are some inexpensive low profile gas blocks that would work just as well. clamp-on style is probably best if your barrel isn't dimpled for a set screw. Troy does make a longer low-profile gas block that's designed to hide the taper pin cuts in your barrel, but it's definitely not the cheapest option.

For gas block install, brownells makes some plastic pins for aligning the gas ports. They're super easy to use. When you're all done and set, you can just use a cleaning rod to break the pin and let it fall out of the barrel. The other easy way to align a gas block on a disassembled barrel is to plug the chamber end of the barrel and just blow through the muzzle end. You'll know you're aligned when you feel the lest amount of resistance.
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post #5 of 20 (permalink) Old 04-15-2017, 07:39 AM
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I agree. Ive done it before and it works fine. Little touch up paint and you cant even tell it was done. that and the extended handguard covers it anyway. Kind of silly to waste money buying a new gas block when your going to cover it anyway.
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If you take your time and do a neat job of it, there's nothing wrong with trimming down an a2 front sight to make a poor mans low-profile gas block. As mentioned before, it's not the most asthetic option, so it's probably best reserved for use with a free float tube that will completely cover it. There are some inexpensive low profile gas blocks that would work just as well. clamp-on style is probably best if your barrel isn't dimpled for a set screw. Troy does make a longer low-profile gas block that's designed to hide the taper pin cuts in your barrel, but it's definitely not the cheapest option.

For gas block install, brownells makes some plastic pins for aligning the gas ports. They're super easy to use. When you're all done and set, you can just use a cleaning rod to break the pin and let it fall out of the barrel. The other easy way to align a gas block on a disassembled barrel is to plug the chamber end of the barrel and just blow through the muzzle end. You'll know you're aligned when you feel the lest amount of resistance.

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post #6 of 20 (permalink) Old 04-15-2017, 12:07 PM Thread Starter
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Lloyd, how did you cut it off?

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post #7 of 20 (permalink) Old 04-16-2017, 05:31 AM
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took it off the gun and cut it on a band saw
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Lloyd, how did you cut it off?

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post #8 of 20 (permalink) Old 04-17-2017, 09:57 AM
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took it off the gun and cut it on a band saw
+1 for band saw. If you want it to look like a factory job, just clean up the rough edges with a Dremel and cover the shiny part with a good quality high-temp paint.
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post #9 of 20 (permalink) Old 04-18-2017, 09:48 AM
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Quote:
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Has any one cut the front sight off the gas block to accommodate a long after market hand guard?

ch
Yes. I have done them both on the gun and removed. I have done them with a dremel and with a hacksaw.
It's kind of a deep cut for a dremel, the wheel wants to bind, but definitely doable. Better with the larger, fiber reinforced wheels. It's hard, tough, so a hacksaw isn't really easier. If using a saw, you'll need a good blade. Hacksaw is easier if it's removed first.
In both cases I clean up and round off the top after. I use a belt sander for this, I suppose it could be filed, or ground.

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post #10 of 20 (permalink) Old 04-18-2017, 11:54 PM
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angle grinder with a cut wheel gets it done. i prefer a cut a2 so i can keep it pinned.
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