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80% P320 Compatible Insert - MUP 1
The Modular Universal Pistol 1 (MUP-1) is a great base for your next build. The MUP-1 is compatible with Sig Sauer P250, Sig Sauer P320 and the EXO-1 Chassis system. Your MUP-1 can be made into a 9mm, 40 S&W, 357 SIG and 45acp (with slight modification). MUP-1 are all compatible with the current p320 "drop safe" upgraded parts.