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Posted: 5/2/2021 10:25:32 PM EDT
Anyone have experience with these? I saw no mention in the purchase listing that these were 9mm only. Went to install, and noticed there's a nipple that lines up with the gas tube hole on the upper. This nipple prevents the handguard from clearing the gas tube.Handguard
Link Posted: 5/3/2021 5:46:11 AM EDT
Originally Posted By cibergray:
Anyone have experience with these? I saw no mention in the purchase listing that these were 9mm only. Went to install, and noticed there's a nipple that lines up with the gas tube hole on the upper. This nipple prevents the handguard from clearing the gas tube.Handguard
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That's a slot for the anti-rotation pin.  If your receiver has the corresponding hole, you simply insert the included pin that came with the handguard and it slots into the receiver to prevent any rotation.  That hole is not related to the gas tube at all.

Link Posted: 5/3/2021 10:30:58 AM EDT
Originally Posted By cibergray:
Anyone have experience with these? I saw no mention in the purchase listing that these were 9mm only. Went to install, and noticed there's a nipple that lines up with the gas tube hole on the upper. This nipple prevents the handguard from clearing the gas tube.Handguard
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Have you tried it, or just assuming?
Link Posted: 5/11/2021 11:47:45 AM EDT
I have installed several and had no issues?
Link Posted: 5/12/2021 2:43:24 AM EDT
that hole isnt for the gas tube
Link Posted: 5/12/2021 3:19:51 AM EDT
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Originally Posted By s4s4u:
Have you tried it, or just assuming?
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@cibergray
inquiring minds want to know, just for "closure", you know.
Link Posted: 5/12/2021 8:24:05 AM EDT
Where's the nipple?
Link Posted: 5/12/2021 9:39:55 AM EDT
So does a guy have to put a hole in his receiver in order to get the anti rotation device to work?
Link Posted: 5/12/2021 10:13:16 AM EDT
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Originally Posted By jhc:
So does a guy have to put a hole in his receiver in order to get the anti rotation device to work?
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I question it's necessity as the handguard attaches to the barrel nut in 3 locations with 2 screws each.  Likelyhood of torqued barrel nut reversing is highly minimal at most.
Link Posted: 5/12/2021 4:29:12 PM EDT
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Originally Posted By s4s4u:


I question it's necessity as the handguard attaches to the barrel nut in 3 locations with 2 screws each.  Likelyhood of torqued barrel nut reversing is highly minimal at most.
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This
Link Posted: 5/12/2021 10:03:29 PM EDT
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Originally Posted By jhc:
So does a guy have to put a hole in his receiver in order to get the anti rotation device to work?
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the V Seven uppers come with the hole precisely and correctly located, dimensioned, to accept a pin that locks the handguard to the upper, as their anti-rotation device.  if you're not using their upper, you wouldn't use the pin.

https://www.vsevenweaponsystems.com/2055-enlightened-ar-15-upper-receiver/
Link Posted: 5/12/2021 10:07:17 PM EDT
That whole FPNI thing.....
Link Posted: 5/13/2021 5:11:26 PM EDT
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Originally Posted By s4s4u:


Have you tried it, or just assuming?
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I've called them before about this. Call them. Get that peace of mind
Link Posted: 6/4/2021 10:49:58 AM EDT
So for inquiring minds...

It was due to a gas tube/ barrel nut incompatibility. Was trying to run a 5 inch 7.62x39 barrel with a micro gas system. The gas tube wasn't clearing the barrel nut, and was pushing it up. Because of that the handguard wasn't clearing the gas tube.
Link Posted: 6/5/2021 8:44:16 AM EDT
[Last Edit: 6/5/2021 8:46:04 AM EDT by pebble]
Originally Posted By cibergray:
Anyone have experience with these? I saw no mention in the purchase listing that these were 9mm only. Went to install, and noticed there's a nipple that lines up with the gas tube hole on the upper. This nipple prevents the handguard from clearing the gas tube.Handguard
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deleted nvm
Link Posted: 6/13/2021 7:34:42 AM EDT
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Originally Posted By s4s4u:


I question it's necessity as the handguard attaches to the barrel nut in 3 locations with 2 screws each.  Likelyhood of torqued barrel nut reversing is highly minimal at most.
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Discussion ForumsJump to Quoted PostQuote History
Originally Posted By s4s4u:
Originally Posted By jhc:
So does a guy have to put a hole in his receiver in order to get the anti rotation device to work?


I question it's necessity as the handguard attaches to the barrel nut in 3 locations with 2 screws each.  Likelyhood of torqued barrel nut reversing is highly minimal at most.


Completely disagree. It can happen, and has happened with virtually every brand of rail that doesn’t have an index tab or anti rotation device. I’d imagine this is why Barrett and Geissele added them to their complete rifles. This isn’t only likely to happen depending on how hard you abuse your rifle. If you don’t ever drop your AR or do much outside target practice, then yeah it doesn’t matter.
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