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MFI Copy of SWISS SANs SIG 550 / 551 / 552 Style Quick Detach Take Down Receiver Pin for SIG 556 DEFECTIVE x 6 Pins Gunsmith Special / SUPER SALE / NO RETURNS

Designed specifically to fit the SIG 556 1st Model Series Rifles & Pistols (NOT CLASSIC).


Limited Supply: only 6 remaining
Was: $138.00
Sale: $15.00
Save: 89%
Save: $123.00
5 5 2

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MFI Copy of SWISS SANs SIG 550 / 551 / 552 Style Quick Detach Take Down Receiver Pin for SIG 556 DEFECTIVE x 6 Pins Gunsmith Special. NO RETURNS.

The defect can be in the roll pin that hold the internals in place protruding out one side as they are not staked properly, or the steel spring clips end that hold the pin in the receiver being too long or too short, or the spring steel of the internals having rust and can cause them to fail, or all of the aforementioned. Issues are not cosmetic.

These pins have a light Parkerization on the bodys and a heavy / standard Mil. Spec. Parkerizing on the push button head.

These are luck of the draw as I grab whatever is in front of me. There is no hand selection and thus these have no warranty or return policy. At this price I assume you will either get one or two that will work or you will be able to take them apart and make 1-4 usable.

If the above sounds like too much for you to deal with then you should try to find original pins that are out there for $40.00 a piece.

550 Style Quick Detach Take Down Receiver Pins:

  • Weapons Grade Steel Parkerized Medium SIG Gray. NOT Black.
  • Direct Copies of the Original.
  • 100% Made in the USA.
  • Can Replace BOTH front and rear pins on 556 First Model Rifles & Pistols (NOT Classic or 551A1).
  • Photo actual product.
We have made an exact reproduction of the SIG Take Down Pin that has hardened steel reverse cut angled clips that spring out and hold the pin in place. These are not just simple QD pins like HK. They are far more complex and stronger than anything on the market. Typical SIG over-design and we love it!

Note that we are NOT using Ball Bearings to replace the original SIG Hardened Spring Clip that stick out the ends. Ball Bearings are known to slip past the edge of the receiver that they are supposed to grab hold of. Unless you depress the opposite end these will NOT come out. You can even whack them with a hammer and they will not go anywhere. As you can see these lock in tight and hold and they will scratch your receiver.

These can replace BOTH the front and rear take down pins on your SIG 556 First Model Weapons. Far faster and easier to install and remove than the SIG 556 pin / bolt / screw. When replacing the rear lug pin you will no longer need the small detent pin and spring that keeps the standard 556 AR15 style pin in place. But know that we also make a Special Rear Captured Take Down Pin that looks like the Original, but is Captured.



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.

Shipping Information

  • Item Requires Shipping
  • 0.1 lbs.
  • $2.45

Customer Reviews

Comment Total Reviews (2)

Wow what a deal!
  • Currently 5/5 Stars

Reviewed by:

Product ownership: Less than 3 months

Purchased from: MFIAP.COM

I got these and they all worked no issues. I did notice that the roll pins that hold the guts in can slide out a little on one side. I just staked them with a punch on both sides then filed the raise edge down. No issues at all.

Best deal in 2016.
  • Currently 5/5 Stars

Reviewed by:

Product ownership: Less than 1 week

Purchased from: MFIAP.COM

I was a little worried about these being "DEFECTIVE", but after reading the description I figured it would worth the risk. Only 1 was unusable as the spring clip on the inside was broken for rust. I took all apart (easy to do) and checked everything. They are oiled well so not sure how the rust happened? 2 had one side of the spring clip that was too long, but that was easy to fix with a file / belt sander. I reassembled and used a automatic center punch to keep the roll pin from coming out. Had to round over the area a hit with the punch with a hand file. All in all 30 minutes of work to save $220.00. S&H was only $4.85 as well and arrived in 3 days! Super deal!!!

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