Proud to be on the Frontline on the war on terror!

Additional Images

MFI SIG Classic 556 / 556-R / 550/1/2 Front Flip Up (Folding) Sight & Windage Adjustment Wheel (See instructions for installation) / Price Includes S&H via 1st Class USPS Mail & Insurance

Designed specifically to fit the SIG 556 & SIG 522 Series Rifles & Pistols.


Limited Supply: only 3 remaining
Was: $125.00
Sale: $88.00
Save: 30%
Save: $37.00
5 5 2

Customize Your Item

- USPS Priority Upgrade / 1st In L -
- WITHOUT Windage Wheel -
- No Export / US DOS or US DOC -
 * required
SHIPPING IS INCLUDED VIA USPS on orders over $82.00 Dollars AND OR If S&H is INCLUDED in the Title / Discription.


MFI SIG Classic Front Flip Up (Folding) Sight:

With so many requests from customers for a front sight for their SIG 556 Classic / Current Production weapons that matched the height of their in the Rail Pop sickle Stick Rear Flip Up Sight, we knew we needed to do something.

This height is what you would find on any SIG 556 rifle or pistol produced after August 2009.

This matches the height of the SIG USA in the Rail Nail File Sight / Popsicle Stick Sight and the SIG USA rear Diopter / Drum Style Sight.

The blade is narrowed at the top to a standard Target Width of 0.080" wide, which vastly improves your ability to see and track. It also allows the shooter to have a more pin point accurate choice of bullet impact.

The Fiber Optic Blade that we make for the SIG 556 / MAD Original Sights will NOT be the right height for this sight base. It will fit into the base, but will NOT give you the correct height / point of impact.

We have copied the original Swiss SIG SANs SG 550/1/2/3 (PE90) Non-Hooded Flip Up Front Sight Base in terms of height so that you get the lowest possible obstruction when the sight blade is in the down position. This is ideal when running an open style red dot or lower power scope.

This will NOT line up with the MFI MAD Rear Sight or the Corresponding Front Sights with the taller base with or without the Fiber Optic.

  • Improved Positive Lock Up & Down.
  • Center Alignment Marking.
  • (Hex Key) Adjustment for windage.
  • Includes Front Sight Wheel / Bolt Windage Adjustment.
  • Weapons Grade Steel / Mil. Spec. Black Oxide Coating.
  • Heat Treated to about Rockwell 30.
  • 100% Made in the USA.
  • Photo is Actual Product.
  • Height: Flipped Down @ 0.275 Inches / 6.9mm (from the top of the Picatinny rail)

  • Fits All SIG 556 & 522 Style Rifles & Pistols:

    • SIG 556 Standard Rifle
    • SIG 556 Patrol Rifle
    • SIG 556 SWAT Rifle
    • SIG 556 Pistol
    • SIG 556 Classic Rifle
    • SIG 556-R / SIG556R / SIG 556 R Rifle in 7.62 X 39
    • SIG 522 Standard Rifle
    • SIG 522 Pistol
    • SIG 553 Pistol / SBR
    • CDNN SIG 551A1 Rifle
    • West Coast Armory SIG 551 Rifle


    In accordance with the Joe Biden & Beto O’Rourke directive I personally as well my company no longer own(s) or possess any firearms or ammunition. This includes but is not limited to: Handguns, Pistols, Shotguns, Rifles, NFA items, Hog Legs, Fire Sticks, Smoke Poles and or Thunder Clubs.

    All firearms that appear on our web site, regardless of what is written about them, are not owned by the company nor possessed by anyone associated with MFI and may even be CGI / PhotoShop.

    Therefore regardless of any new firearms laws / taxes, no probable cause can EVER be assumed on any property (stationary or mobile) owed by myself or MFI.

    AGAIN: We are 100% in compliance with any possible new “Biden / O’Rourke Public Safety Act” and therefore NO PROBABLE CAUSE could ever be assumed.

    Lastly anyone arriving with a warrant of any kind will be assumed to be an IMPOSTER with intent on murdering us and will be treated as such without warning.

    Those invading our territory may receive serious and even fatal wounds from rusty blades, clubs with bent nails, spear tips, arrows and or crossbow bolts.

  • Restrictions

    This item is NOT RESTRICTED FOR DOMESTIC US SALES in any way and we offer DOMESTIC USA shipping to ANYONE. We ship to all 50 US States as well as all US Territories i.e. Guam & Puerto Rico. Sorry we can NOT ship to ANY APO address regardless of actual location.

    This item is 100% RESTRICTED FOR EXPORT OUTSIDE THE USA. The US Department of State regulates / restricts this product and it is NOT EXPORTABLE outside the USA even to LE, Governments or Military without State Department approval.

    This approval is AVAILABLE through MFI as we are an ITAR / Dept. of State Registrant with the Directorate of Defense and Trade Controls Office. We can obtain a US State Dept. Export License for you.

    Please feel free to contact us if you have any questions on this issue.


    The front sight's dove tail must slide somewhat freely in the dove tail of the gas block.

    Meaning: You should NOT have to use a hammer to drift the sight side to side, but it should also NOT be so loose as to slide easily. The right amount of friction is so that the sight drifts sideways via a significant amount of force using your fingers... i.e. nearly all of your might using both hands(tightest) to as easy as half of your strength (loosest). The idea here is that the sight has enough friction in the dove tail not to move during firing.

    Failure to do this WILL result in the stripping of the cross-over bolt or the shearing of the roll pin inside the donut / round nut.

    Hand fitting is required as the dove tails in the gas blocks vary from production to production. Hand fitting can be done via a small hand file used on the slanted edges of the sight's dove tail.

    How to install the roll pin in the front sight.

    It is easy to mess up the roll pin when you first try to install it. Read below to avoid the pitfalls. Not all SIG 556 series weapons come with a front sight installed. So issues like this arise most often when the user is NOT first removing a similar front sight from the weapon and thus is completely unfamiliar with the requirements.

    There is a first time for everything and that is a part of any weapons system.

    When SIG installs these at the factory they have a special fixture or a second person to hold the weapon. While a fixture or third person is NOT required it sure makes it a lot easier. All you need is someone to hold the weapon while you hold the punch and hammer.

    Be sure that the hole in the donut and spline are clean / free of metal shavings.

    The most common mistake that leads to messing up a roll pin is not having the hole in the spline / adjustment bolt and the hole in the round / donut wheel lined up. You will have to use a punch or something to be absolutely sure of the alignment. Use a 1/16” punch or 1/16” drill bit or 1.5mm allen key… or look around the house and shop for something that fits through both.

    The number of turns to get the holes lined up is between 2.5 and 3 full rotations (you have to look down the hole). The windage bolt should NOT go past the point of being flush with the outside edge of the donut.

    It is a lot easier to file or grind down the roll pin at one end and then gently collapse the same end with a vice grips of pliers so that it just fits / sits in the hole of the donut. This will free up one hand. This is almost a requirement.

    Lube the hell out of the roll pin and hole of the donut and spline.

    Always start with your 1/16” punch (or whatever) 3/4 the way through to assure alignment. As you drive the roll pin in the punch will move out the opposite side.

    Good luck...

    These roll pins are specially made for us so, if you mess up the roll pin you can buy a spare from us on this page:


    Shipping Information

    • Item Requires Shipping
    • 0.1 lbs.
    • SHIPPING IS INCLUDED VIA USPS on orders over $82.00 Dollars AND OR If S&H is INCLUDED in the Title / Discription.

    Customer Reviews

    Comment Total Reviews (2)

    Classic folding front sight
    • Currently 5/5 Stars

    Reviewed by:

    Product ownership: Less than 1 week

    Purchased from: MFIAP.COM

    I just received my new sight and it is perfect. Height matched my original front sight, folds to a very low profile.

    Works great!
    • Currently 5/5 Stars

    Reviewed by:

    Product ownership: Less than 1 year

    Purchased from: MFIAP.COM

    I am so glad someone makes stuff for the SIG Classic. I got this a couple months ago and it works perfectly and no slop or recoil fall backs.

    AAAA+++ Highly recommended.

    You must login to post a review.

    Share MFI SIG Classic 556 / 556-R / 550/1/2 Front Flip Up (Folding) Sight & Windage Adjustment Wheel (See instructions for installation) / Price Includes S&H via 1st Class USPS Mail & Insurance on Facebook

    Items: 0
    Total: $0.00

    Why Shop From MFIAP?

    Fast Shipping

    SHIPPING IS INCLUDED on all orders over $82.00 See our detailed shipping rates. 60 Day Money Back on Returns. View our policies and procedures.

    Superior Customer Service

    Find the answers to commonly asked questions.

    Secure Web Transactions

    All transactions involving personal information are secured through SSL encryption.