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

Click on image to zoom

MFI SIG Classic Hybrid Takedown Pin 550/1 Style SET

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


Limited Supply: only 5 remaining
Was: $60.00
Sale: $40.00
Save: 33%
Save: $20.00
5 5 1

Customize Your Item

- USPS Priority Upgrade / 1st In L -
- No Export / US DOS or US DOC -
 * required


550 Style Captured Take Down Receiver Pin SET:

This page is for a SET of TWO (2) Pins. 1 Front & 1 Rear Pin.

  • Weapons Grade Steel / Black Oxide Coating Mil. Spec.
  • Heat Treated to about Rockwell 34.
  • 100% Made in the USA.
  • (A) Replaces Front Captured Pin on SIG 556 Classic Rifles & Pistols (NOT 1st Model SIG 556s).
  • (A) Replaces Front Captured Pin on SIG 522 (.22 LR) Classic Rifles & Pistols.
  • (B) Replaces Rear Captured Pin on (BOTH) SIG 556 Classic Rifles & Pistols (AS WELL AS All 1st Model SIG 556s).
  • (B) Replaces Rear Captured Pin on SIG 522 (.22 LR) Classic Rifles & Pistols.
  • Photo actual product.

These pins are designed to look like the Original SIG 550 / 551 / 552 / PE 90 pins, in that they have what appear to be push button heads, but in fact act exactly as the existing CAPTURED pins on the SIG 556 Classic Rifle & Pistols, SIG 522 (.22 caliber ) Classic Rifle & Pistols & just the rear captured pin on the Original / 1st Model SIG 556 Rifles and Pistols. They also fit the NEW CDNN SIG 551 A1

These can NOT be used to convert your SIG 556 1st Model front take down screws to a captured set up without major modification to your lower receiver and some spare parts.

These will NOT fit / work with the Original Swiss SIG SANs Lowers.

Fits MOST SIG 556 & 522 Style Rifles & Pistols:

  • SIG 556 Classic Patrol Rifle
  • SIG 556 Classic SWAT Rifle
  • SIG 556 Classic Rifle
  • SIG 522 Classic Standard Rifle
  • SIG 522 Classic Pistol
  • CDNN SIG 551A1 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.


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.


  • MFI
  • Available
  • New

Shipping Information

  • Item Requires Shipping
  • 0.0 lbs.
  • $1.95

Customer Reviews

Comment Total Reviews (1)

New 551A1 finished
  • Currently 5/5 Stars

Reviewed by:

Product ownership: A year or longer

Purchased from: MFIAP.COM

I saw these on a friends gun and had to have them. Yes strictly cosmetic, but they really finish off the look of the SIG 551-A1. THANKS!!! Work perfect and installed in minutes.

You must login to post a review.

Share MFI SIG Classic Hybrid Takedown Pin 550/1 Style SET 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.