It's come to our attention that some of the product cards that come with our 25-round magazines are not printed on the reverse with the modification dimensions. Here is the needed 'slot' that needs to be milled into a non TUF receiver in order to use the mags.
NOTE : This modification MUST be done by a Red Seal Machinist or Gunsmith. We will not be held liable for any other person's work to your receiver. If you choose to send us the receiver for the modification we charge $60 + tax and shipping if required. Call or email the shop for details of sending in your firearm for the work.