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AR-556 Fixed front sight

This is a discussion on AR-556 Fixed front sight within the Ruger Semi-Auto forums, part of the Rifle & Shotgun Forum category; Good afternoon all, I have searched around and found a few articles but wanted to get your feedback. I have an AR-556 and I bought ...


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Old March 11th, 2015, 08:29 AM   #1
 
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AR-556 Fixed front sight

Good afternoon all,

I have searched around and found a few articles but wanted to get your feedback.

I have an AR-556 and I bought a scope. The laser is blocked by the front fixed sight. My gun dealer wanted the barrel measurement (because he could not find it online) so he could order a low profile one. I decided to call Ruger and after getting transferred around a tech told me the following:

1. They do not give out the measurements
2. They do not recommend removing the gas block
3. They do not sell aftermarket blocks

I am floored. I was thinking about having a gunsmith drill a hole in the front sight to allow the laser through, but if alignment is off, I could have a heck of a time.

Thanks for any advice/feedback



Charlie
Bangor, Maine
Proud Ruger owner (though irritated with them today)




Last edited by cvillard; March 11th, 2015 at 09:04 AM.
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Old March 11th, 2015, 10:00 AM   #2
 
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Personally, I would ditch the laser / scope combo and purchase a quality optic.

However, if you really want to move forward with this project, you could either replace the FSB with a low profile gas block, or shave the FSB down with a dremmel.

If you go the replacement route, the standard AR barrel is .750" diameter at the gas block.

I would use a dremmel and just cut off the top part, leaving a functioning, pinned gas block. You can shape it with a grinding wheel on a dremmel and then hit the cut metal with some high temp paint... then cover the whole thing with a free float tube with a rail so that you can mount a flip up front sight.
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Old March 11th, 2015, 10:47 AM   #3
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Good advice from cyphertext. if you ever want a front sight again you can purchase a clamp on sight
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Old March 11th, 2015, 11:27 AM   #4
 
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I recommend you build an upper from scratch and save your Ruger upper. I think you will be money and time ahead. You can build the upper you want and just swap them when the urge hits you. If you don't want to build there are a ton of places you can get an upper for a fair price.

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Old March 11th, 2015, 12:22 PM   #5
 
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Originally Posted by kwg020 View Post
I recommend you build an upper from scratch and save your Ruger upper. I think you will be money and time ahead. You can build the upper you want and just swap them when the urge hits you. If you don't want to build there are a ton of places you can get an upper for a fair price.

kwg
How would he be money ahead? No cost to use a dremmel, and a clamp on gas block with a flip up sight can be had for $86 if he doesn't want to mess with a free float set up... lots of ways to skin this cat, and all are cheaper than a new upper!

http://www.brownells.com/rifle-parts...prod21446.aspx
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Old March 11th, 2015, 12:41 PM   #6
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Couldn't your smith just remove the sight, measure, order the part, and then install it? Parts come in within a week.
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Old March 11th, 2015, 07:21 PM   #7
 
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Remove the laser/cat toy. If you want an optic, get a quality scope without the laser or a good red dot that will co witness with you iron sights. You could also buy a riser for the scope mount.

If you want the laser/cat toy, flashlight and all the other crap that hangs on the hand guard, remove the front sight, replace it with a low profile gas block and put on a free float quad rail. Then you can hang everything from it you want.

The best advise you got was to buy a 2nd upper the way you want with all the rails and flip up sights. Then you can swap from a stock AR to a tacticool AR anytime you want.
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Old March 11th, 2015, 07:56 PM   #8
 
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The best advise you got was to buy a 2nd upper the way you want with all the rails and flip up sights.
Typically, a second upper is going to sprout a second lower...
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Old March 12th, 2015, 07:15 AM   #9
 
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Quote:
Originally Posted by cyphertext View Post
Typically, a second upper is going to sprout a second lower...
I find my lowers seem to breed faster than uppers. I get my lowers built and then finish figuring out what the furniture and upper will be.
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Old March 12th, 2015, 09:51 AM   #10
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cvillard, There is a very inexpensive option and that is to replace the front sight gas block assembly with an extended low profile gas block. You can get by even cheaper with a non-extended gas block but the pin holes for the Ruger front sight will show.

Ruger AR 556 uses a standard .750" diameter gas block .... the most common. Of course you have to remove the flash suppressor to change the gas block but that isn't a big deal. By removing the factory front sight and gas block assembly, you can use conventional Picatiney or Weaver rings to mount a scope on the factory Picatiney base. This will give you an excellent view through the scope with a good cheek weld. If you use the base extenders to mount a scope high enough to clear the front sight, your head will be so high .... there is no way you can get a decent cheek weld.

There are many companies that make gas blocks. I recommend buying a steel extended gas block with set screws ... not a clamp-on. Here's a link to a modestly priced yet excellent quality extended low profile, 3-screw gas block: http://www.brownells.com/rifle-parts...prod23163.aspx
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Old March 12th, 2015, 04:53 PM   #11
 
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Quote:
Originally Posted by cyphertext View Post
How would he be money ahead? No cost to use a dremmel, and a clamp on gas block with a flip up sight can be had for $86 if he doesn't want to mess with a free float set up... lots of ways to skin this cat, and all are cheaper than a new upper!

http://www.brownells.com/rifle-parts...prod21446.aspx
Because you will not settle for one AR. This may be your first but the odds are you will have a second. You can have 2 uppers for one lower. I have 5 AR's with 3 uppers and 2 more lowers yet to build. I'm behind the power curve for uppers, but I have not yet decided what their configuration will be. Right now 2 of the 3 uppers I have, have a fixed front sight. My bet is at least one out of the next two I get will also have a fixed front sight. Sooner or later you will want that front sight once you start exploring upper options.

Ruger has made a really fine upper with a front sight. A second upper opens up so many more options. It's just a matter of time before you get the bug. By the way, I do not own a laser. I don't foresee a future with a laser. I see lasers as a crutch I do not need. When the crap hits the fan the toys will fail you. Your fall back position will probably include fixed iron sights.

kwg
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Old March 12th, 2015, 04:58 PM   #12
 
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Thanks for the feedback all. The scope actually has a red and green dot within the sight, it was more of a aesthetic thing that bothered me about not being able to use it, I suppose it really isnt a big deal.

Thanks again for all the tips and feedback, I dont believe this will be my only AR
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Old March 12th, 2015, 06:59 PM   #13
 
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Originally Posted by kwg020 View Post
Because you will not settle for one AR. This may be your first but the odds are you will have a second. You can have 2 uppers for one lower. I have 5 AR's with 3 uppers and 2 more lowers yet to build. I'm behind the power curve for uppers, but I have not yet decided what their configuration will be. Right now 2 of the 3 uppers I have, have a fixed front sight. My bet is at least one out of the next two I get will also have a fixed front sight. Sooner or later you will want that front sight once you start exploring upper options.

Ruger has made a really fine upper with a front sight. A second upper opens up so many more options. It's just a matter of time before you get the bug. By the way, I do not own a laser. I don't foresee a future with a laser. I see lasers as a crutch I do not need. When the crap hits the fan the toys will fail you. Your fall back position will probably include fixed iron sights.

kwg
He has already decided that he doesn't want the front sight if he wants the laser to be operational, so he is not ahead by buying a second upper. By shaving down the current front sight or replacing it with a low profile gas block and adding a free float tube with folding front sight, or adding a gas block with a folding front sight already on it he would be ahead, as he has the best of both worlds. If he wants to use optics, fold the front sight down. If he wants to use irons, flip them up.

I have multiple ARs as well, but all of mine are complete... non of that swapping uppers around crap for me... complete rifle is how I roll. Two with fixed FSB and two with folders. I use the fixed ones, and my son likes the tacticool ones with flip ups. All have optics.
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Old January 12th, 2016, 02:53 PM   #14
 
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cvillard
i have the same setup and have been contemplating drilling a hole through the site as well. I own a redfield widefield scope on my 308 hunting rifle for 20 years which is why i bought this one. I realise the company has been sold etc but that wide field served me well and leupold being the parent company gives me more confidence in the products. I would hardly call this a toy if it's 1/2 the quality of my original it's one hell of a solid optic!
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Old January 12th, 2016, 05:56 PM   #15
 
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for those of you thinking the FSB removal is a piece of cake, forgetaboutit.....Bushmasters have been known to be notoriously tough to remove the FSB pins, I have found the winner of that contest.....I searched and searched about which way to remove them and found more people ( who probably never removed them ) saying it doesn't matter which way to push out the pins, I tried to get them out R to L and got them to move about 1/4 of the way.....pounded them back in and tried it from L to R and got them about another 1/4 of the way out....now I'm in a position where I've probably rounded over the pins and its binding in the hole making it even harder and the pin head harder with every strike of the punch.
Yes I have removed 3 or 4 FSB in the past and I'm using the Brownells FSB jig ( orange hockey puck looking thing ) which BTW the Ruger FSB doesn't fit into unless you modify it.

I'm about to throw this eff'in thing

BTW... the delta ring screws off it doesn't pull down like a regular AR and the barrel nut doesn't look like other Mil-spec barrel nuts

Last edited by rentprop1; January 12th, 2016 at 06:34 PM.
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