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Posted: 11/18/2008 5:45:09 AM EDT
I'm having 2nd thoughts on my spec to install an end cap on the lightweight YHM Free float forearm.    I was  informed that the benefit of a ltw free float is that it doesn't affect barrel harmonics and accuracy and the ltwt aspect helps with cooling.  I asked a YHM tech and they said that they install the end caps on all their rifles that they build.

My thinking that the end cap would help keep gunk out of the front end.  It has vent holes, so can still help cooling.  This is gonna be a NJ legal AR, so permanent muzzle brake and I'm worried if I ever need to remove/replace the forearm that I won't be able to take it off.  The front sight won't be able to slip over the  brake.  Don't know if I'll be able to remove it by removing the barrel from the receiver and sliding it off from that end.

anyway, does anyone have an end cap installed on their free float forearms and is it worth it or not?

I might still be able to remove it from the spec before they proceed with the build.

Here is a photo of the end cap.

http://img204.imageshack.us/img204/8923/yhm9484qc6.th.jpghttp://img204.imageshack.us/images/thpix.gif
Link Posted: 11/18/2008 6:44:26 AM EDT
I am no expert, but I do own a rifle length yhm rail.  I chose not to put one on and haven't noticed any negative effects.... I don't see end caps on any of the higher end rails such as Larue or Daniel Defense.  

I think it is purely an aesthetic thing
Link Posted: 11/18/2008 6:56:19 AM EDT
Originally Posted By Jerold:
I'm having 2nd thoughts on my spec to install an end cap on the lightweight YHM Free float forearm.    I was  informed that the benefit of a ltw free float is that it doesn't affect barrel harmonics and accuracy and the ltwt aspect helps with cooling.  I asked a YHM tech and they said that they install the end caps on all their rifles that they build.

My thinking that the end cap would help keep gunk out of the front end.  It has vent holes, so can still help cooling.  This is gonna be a NJ legal AR, so permanent muzzle brake and I'm worried if I ever need to remove/replace the forearm that I won't be able to take it off.  The front sight won't be able to slip over the  brake.  Don't know if I'll be able to remove it by removing the barrel from the receiver and sliding it off from that end.
anyway, does anyone have an end cap installed on their free float forearms and is it worth it or not?

I might still be able to remove it from the spec before they proceed with the build.

Here is a photo of the end cap.

<a href="http://img204.imageshack.us/my.php?image=yhm9484qc6.jpg" target="_blank">http://img204.imageshack.us/img204/8923/yhm9484qc6.th.jpg</a><a href="http://g.imageshack.us/thpix.php" target="_blank">http://img204.imageshack.us/images/thpix.gif</a>



From the YHM website: "Use these screw-in end caps" So they are removable.
Link Posted: 11/18/2008 7:04:23 AM EDT
I have never met anyone who ever had a problem with sticks and twigs getting stuck in the open end of their forearm. It seems a solution to a non-existent problem.
Link Posted: 11/18/2008 7:48:18 AM EDT
Originally Posted By agentile:
Originally Posted By Jerold:
I'm having 2nd thoughts on my spec to install an end cap on the lightweight YHM Free float forearm.    I was  informed that the benefit of a ltw free float is that it doesn't affect barrel harmonics and accuracy and the ltwt aspect helps with cooling.  I asked a YHM tech and they said that they install the end caps on all their rifles that they build.

My thinking that the end cap would help keep gunk out of the front end.  It has vent holes, so can still help cooling.  This is gonna be a NJ legal AR, so permanent muzzle brake and I'm worried if I ever need to remove/replace the forearm that I won't be able to take it off.  The front sight won't be able to slip over the  brake.  Don't know if I'll be able to remove it by removing the barrel from the receiver and sliding it off from that end.
anyway, does anyone have an end cap installed on their free float forearms and is it worth it or not?

I might still be able to remove it from the spec before they proceed with the build.

Here is a photo of the end cap.

<a href="http://img204.imageshack.us/my.php?image=yhm9484qc6.jpg" target="_blank">http://img204.imageshack.us/img204/8923/yhm9484qc6.th.jpg</a><a href="http://g.imageshack.us/thpix.php" target="_blank">http://img204.imageshack.us/images/thpix.gif</a>



From the YHM website: "Use these screw-in end caps" So they are removable.


yes they are removeable, if you can remove your perm attached muzzle break

Link Posted: 11/18/2008 7:52:31 AM EDT
I've got an end cap and they seem pretty light.  You could always unscrew it and "carefully" cut it into two pieces if you later wanted to remove it.
Link Posted: 11/18/2008 8:29:02 AM EDT
Originally Posted By JHarm:
Originally Posted By agentile:
Originally Posted By Jerold:
I'm having 2nd thoughts on my spec to install an end cap on the lightweight YHM Free float forearm.    I was  informed that the benefit of a ltw free float is that it doesn't affect barrel harmonics and accuracy and the ltwt aspect helps with cooling.  I asked a YHM tech and they said that they install the end caps on all their rifles that they build.

My thinking that the end cap would help keep gunk out of the front end.  It has vent holes, so can still help cooling.  This is gonna be a NJ legal AR, so permanent muzzle brake and I'm worried if I ever need to remove/replace the forearm that I won't be able to take it off.  The front sight won't be able to slip over the  brake.  Don't know if I'll be able to remove it by removing the barrel from the receiver and sliding it off from that end.
anyway, does anyone have an end cap installed on their free float forearms and is it worth it or not?

I might still be able to remove it from the spec before they proceed with the build.

Here is a photo of the end cap.

<a href="http://img204.imageshack.us/my.php?image=yhm9484qc6.jpg" target="_blank">http://img204.imageshack.us/img204/8923/yhm9484qc6.th.jpg</a><a href="http://g.imageshack.us/thpix.php" target="_blank">http://img204.imageshack.us/images/thpix.gif</a>



From the YHM website: "Use these screw-in end caps" So they are removable.


yes they are removeable, if you can remove your perm attached muzzle break



With a perm attached muzzle break "brake" you wouldn't be able to remove the forearm anyway.
I have one on the one I have.
If removing it is an issue get the Daniel Defence Omega railed forearm.

Bill
Link Posted: 11/18/2008 11:58:10 AM EDT
[Last Edit: 11/18/2008 12:07:05 PM EDT by Bullet175]
I have the cap on my YHMs and it is removable. It just threads in there no problem. I put mine on for no practical reason .....just looks. To me thats about all its good for anyway. But it does clear the perm. phantom FH on the end of my barrel. no need to remove the FH to take the handguard off with the end cap in place. A larger dia. FA or MB may present a problem.
Link Posted: 11/18/2008 12:20:28 PM EDT
Originally Posted By JHarm:
I am no expert, but I do own a rifle length yhm rail.  I chose not to put one on and haven't noticed any negative effects.... I don't see end caps on any of the higher end rails such as Larue or Daniel Defense.  

I think it is purely an aesthetic thing


Thats the way I see it too. I have two of their rails one with and one without



Link Posted: 11/18/2008 12:40:53 PM EDT
But there are two choices for end caps.  Different inside diameters.
Link Posted: 11/18/2008 2:51:56 PM EDT
Originally Posted By GreenLantern:
But there are two choices for end caps.  Different inside diameters.


Actually its not two inside diameters of the rail. The difference is the size of the hole that the barrel slides thru.

Have a cover on mine for the looks, too.
Link Posted: 11/18/2008 3:43:59 PM EDT
How do you guys like the YHM rails?  My builder uses the ltwt free float - the one with huge holes between the rails.
Link Posted: 11/18/2008 3:49:11 PM EDT
Originally Posted By JHarm:
I am no expert, but I do own a rifle length yhm rail.  I chose not to put one on and haven't noticed any negative effects.... I don't see end caps on any of the higher end rails such as Larue or Daniel Defense.  

I think it is purely an aesthetic thing


+1

Link Posted: 11/18/2008 3:59:03 PM EDT
Originally Posted By jeffl11:
Originally Posted By GreenLantern:
But there are two choices for end caps.  Different inside diameters.


Actually its not two inside diameters of the rail. The difference is the size of the hole that the barrel slides thru.

Have a cover on mine for the looks, too.


Right, that's why I didn't say inside diameter of the rail.
Link Posted: 11/19/2008 8:54:27 AM EDT
Took a look at the DD Omega Rail FF.

How does that bolt onto the receiver and is the other end open like a typ. FF?
The photos on the site shows  an M4 handguard cap between the FSB and the Rail.

You can see this on the photos from the DD site:

http://www.danieldefense.com/?page=shop/detail&product_id=109
Link Posted: 11/19/2008 10:08:11 AM EDT
Originally Posted By Jerold:
How do you guys like the YHM rails?  My builder uses the ltwt free float - the one with huge holes between the rails.


I like their "Tubes" as I don't need or want rails. There is nothing I want hanging on the front of my gum, but YMMV.
Their tubes do everything I ask them to do. Very good, possibly the best, value for your money.



Bill

Link Posted: 11/19/2008 4:58:06 PM EDT
if it helps, i bought one and did not get the cap.  i have the standard fsb so i wouldnt see most of it anyway.  as mentioned already, most other FF rails dont have caps

purely for looks

when i get my upper back from adco i can post a pic, but by then it would be too late for you to decide
Link Posted: 11/20/2008 5:54:00 AM EDT
The end cap makes for a cleaner, more professional looking installation.
If you are using a standard front sight tower and a permanenet muzzle brake the end cap isn't coming off no matter what size brake you use unless you cut it in two pieces using a Dremel or Foredom tool and a heavy duty cut-off wheel.
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