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Metric Roll Pin (1) for SIG 550/1/2 & 556 NATO & Swiss Bayonet Lug (Taper per product instructions.)

Designed specifically to fit the Swiss SIG SANs 550 / 551 / 552 as well as all USA SIG 556 & SIG 522 Series Rifles & Pistols.


Pricing: $0.40

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Designed specifically to fit the Swiss SIG SANs 550 / 551 / 552 as well as all USA SIG 556 & SIG 522 Series Rifles & Pistols. These are NOT tapered like, but by following our instructions on the "Installing" TAB you can taper them to make the install faster and easier.

Because basic shipping is $1.90 you will likely want to add something else to your order. Other wise you may fill out the order on-line (REQUIRED as it saves us time) and send us cash (for the roll pin only), a copy of the order & a self addressed stamped envelope... that way we will negate the S&H charge.


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.


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.


How to install the roll pin in the Bayonet Lug or Front Sight.

It is easy to mess up the roll pin when you first try to install it. Read below to avoid the pitfalls. 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.

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. This will free up one hand. This is almost a requirement.

While the photo below shows the roll pin in the front sight the principle is the same for the bayonet lug. For the Bayonet Lug you will want to level and back the lug's mounting point with a block of wood. Roll pins are designed to be hard to drive in and it will require significant force with a hammer and punch.

Lubing the roll pin and hole will help getting this done faster.

Be sure to look through the hole to guaranty the alignment.

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:




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Shipping Information

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  • $1.70

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