Builder 4 Pack of MUP-1 80% P320 Sig Sauer® Frame Insert

Builder 4 Pack of MUP-1 80% P320 Sig Sauer® Frame Insert

Original price was: $519.96.Current price is: $467.97.

1877 in stock


Get your Premium OEM Quality 80% Sig P320 MUP-1 Frame Insert NOW 


  • Made from the best 316 stainless steel
  • 9mm, 40 S&W, 357 SIG, and 45acp (with slight modifications)

1877 in stock

SKU: 4PACK-P320-MUP1-FRAME-INSERT-1 Categories: , , , , ,


Steps Remaining

To finish this insert and make it ready for use, the following steps must be completed:

  • Drill all holes
  • Bend side rails
  • Trim rails to size

DISCLAIMER: At U.S. PATRIOT ARMORY, we by no means provide legal advice or legal counsel. Every builder needs to research their respective City, State and Federal laws in the area they are ordering from. We DO NOT provide gunsmithing advice. U.S. PATRIOT ARMORY is not responsible for improper builds, damage or injury due to user error.

Our products are not sold or shipped to residents of New Jersey

WILL NOT SHIP to the following areas: California, Colorado, Connecticut, District of Columbia, Hawaii, Illinois, Maryland, Massachusetts, New Jersey, Delaware, New York, Rhode Island, Washington and Philadelphia, PA. THERE WILL BE A 10% RESTOCKING FEE

Experienced Gunsmith installation and proper new round break in period recommended.


Go to Top