MFI SIG 550/1/2 & 556 NATO Bayonet Lug & Roll Pin. (Taper roll pin per instructions.)

Fits: SIG Sauer 556 Rifle, SIG 551-A1, SIG 556 Pistol, SIG 550, SIG 551, SIG 552 & SIG 522 (.22 caliber)

SIG USA does NOT supply any of their rifles with bayonet lugs. They do however provide a mounting point / round hole type of socket at the bottom of the gas block to attach the lug. The MFI SIG 550/1/2 Bayonet Lug slips into this hole and is held in place by a drive pin / roll pin (included with every lug) that is easy to install.

This allows the attachment of most US / NATO (M7, M9 or M11) bayonets. This is NOT for Swiss bayonets.

SIG Switzerland only made this lug in very limited production as at the time of production they were not members of NATO and had no intentions for this weapons platform to be exported in large quantities. So the production of the NATO bayonet lugs was done as cost effectively as possible. The lugs were intended for only the Civilian USA market and thus did not justify high dollar RND, tooling and mass production in the same quality as the rest of the weapons platform. These lugs were simple castings with rough finishes. Cast parting lines, grind points and uneven seems were normal. Holes for the roll pin were also cast as part of the mold and often had to be widened or elongated to fit properly.

To stay as close to the original as possible MFI followed SIG's original process which has been a head ache to say the least. Our lugs bare all the same tell tale signs / defects you would find on the original lugs. So "YES" uneven surfaces, cast lines, rough grind points and rounded roll pin holes are 100% Normal. We do hand fit every single lug that we ship to be 100% sure that it will mount and function properly. We also grind down one end of the roll pin to help the customer get these started with ease.

NOTE: SIG USA 522 Rifles (.22 LR Caliber) do NOT have enough barrel sticking out the front end to accommodate a bayonet. You will be short by about 3/4 of an inch. The LUG will fit in the hole on the 552 Rifle and Pistol and still looks cool... just not functional. Some early SIG 522's do not have the roll pin drilled in the gas block. No worry as you can still mount one of our Bayonet Lugs by using epoxy. Because you will never mount anything to it, the lug should stay in place.

SPECIAL NOTE: SIG 556 Rifles & 556 Pistols with Quad Rail Hand Guards that use this same hole / socket as a hanger point will NOT be able to mount this product, unless you hand file or grind down the rear of the lug to allow the RIS Hand Guard mounting stud to fit into the same hole at the same time as the lug. This is possible, but requires hand fitting.

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NOTE TO ZEALOUS LEFTIST DEMOCRAT / COMMUNIST ANTI GUN ASSHOLES & THEIR CRONY LAW ENFORCEMENT:

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.

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