[ullie]

...jbusby...here you go...

......you need to think of the two front sight "disks" as a nut and a screw...the "roll pin" disk is the nut and the end with the allen head is the "screw"...the roll pin captures the screw and prevents it from turning in the nut...

...first...position the "nut" end so that you can tap out the roll pin so that it releases the screw...enabling it to rotate and unscrew from the nut...once removed...gently tap out the sight from the dovetail base using a brass punch or wooden dowel...that's all there is to it...

...tip...if you use some penetrant such as WD40 or Breakfree CLP on the parts....it will make the process more easy...just add a few drops here and there...and let sit a few minutes before you start the disassembly...

 

[ciscodelfuego]

a little lost...

Ullie

I tried to follow your directions to remove the OEM front sight. I don't know what you mean by "tapping out the pin" to get the screw and nut to loosen?

Thanks

 

[ciscodelfuego]

Front site removal

I just checked the 556 manual and didn't see anything there about how to remove the front site.

What do you use to tap the pin out? I have an assortment of punches that I use to service my Beretta 390 and 391 but I'm afraid to f*%k something up.

Thanks.

 

[ullie]

...the left disc has a small roll pin that goes through the disc and the windage screw...you need to use a small punch...preferably a roll pin punch...but not necessary...add a little penetrant if it is stubborn...and a little heat...position the disc so that you can tap it out...

 

[enigma]

thanks for the help on this one Ullie!

 

[ciscodelfuego]

THANKS

Thanks Ullie - I got it off. Driving the site out of the dovetail was fun too :x

 

[stevemr2t]

What size is the punch?

 

[Duc1]

Yeah, I'm taking my front sight off as well. I just mounted a Eotech and they don't line up well enough to cowitness. The rear flip up sight is one of the worst I've seen. I would need to get a new front sight to allow the rear enough room to sight in. I hear Sig has three front sights for the 556 depending on how each gun shoots, it seems to me they improve their tolerances allowing them to use one. Oh well.

 

[JoshNC]

I posted this over on Sigforum awhile back:
http://sigforum.com/eve/forums/a/tpc/f/ ... 3941033641

1. Use the appropriate size hex-head and crank the front sight all the way over to one side.
2. Drive the roll pin out of the windage screw's retaining drum.
3. Remove the windage screw and the retaining drum on the opposite side
4. Liberally coat the front sight's dovetail and the gasblock's reverse dovetail with oil.
5. Appropriately support the gasblock and use a punch that is LARGER than the threaded hole for the front sight's windage screw.
6. Tap the front sight base until it comes out.

Be careful not to damage the internal threads on the front sight....I've buggered up a Swiss front sight this way and still need to get a tap to fix it.

The key to minimize your level of aggravation and cursing is to crank the front sight all the way to one side using the windage screw before attempting to tap it out. Coat liberally with oil.

 

[Wiz-of-Awd]

Just to share with others...

I followed these instructions for removal and all went quite smooth - no issues or "stubborn" parts at all.

Everything came apart quite simply with no fuss, and I was able to slowly, carefully and deliberately remove the sight from its dovetail with a small hammer and nylon drift punch.

A.W.D.

 

[malakas]

Got the front sight off and am trying to install an Aurora one but the dovetail is way too large to fit and apparently needs filing. What surface(s) exactly should be filed? If someone is handy with photoshop and can put an arrow on the area(s) to file that would be above and beyond but much appreciated. Thanks.

 

[Sturmgewehr]

Got the front sight off and am trying to install an Aurora one but the dovetail is way too large to fit and apparently needs filing. What surface(s) exactly should be filed? If someone is handy with photoshop and can put an arrow on the area(s) to file that would be above and beyond but much appreciated. Thanks.

File VERY carefully,both sides,not TOO much. go easy! Pete

 

[malakas]

Thanks Pete! So I take it by where it looked like you filed on the pic that you file both sides of, well, both sides...for a total of 4 areas to be filed?

And dumb question but what is that thing/tool in the second pic? Does that somehow make it easier to get the dreaded roll pin in that everyone compains about?

 

[Sturmgewehr]

Thanks Pete! So I take it by where it looked like you filed on the pic that you file both sides of, well, both sides...for a total of 4 areas to be filed?

And dumb question but what is that thing/tool in the second pic? Does that somehow make it easier to get the dreaded roll pin in that everyone compains about?

No only file TWO sides---the one you see and the one on the opposite side! You
are looking at a GALIL site adjustment tool and Israel bottle opener,and pin push out
tool all in ONE! I use the pin to line up the hole in the nut so you can start the pin
from the other side--use the pin from a FOLD DOWN SIG front site or any pin that is
about .075" Pete

 

[MedicMan218]

This helped me just now. Thanks.

 

[bobtom]

Be careful hitting the front sight. I broke mine "tapping" on it when I went to re-install - and I was even using a small wood block to tap on the base. Anyone want to sell their original front sight that they have removed?

 

[Iamscotticus]

http://www.sigarms556.com/threads/classic-sight-removal-and-mi-sight-instal.14896/