The P320 is famous for its excellent ergonomics and high degree of modularity and Strike Industries set out to improve this. The Modular Magazine release for the Sig Sauer P320 allows the user to add different sized extensions to the magazine release for better reachability and ergonomics. The advantage of the MMR over other extended magazine releases is the ability to hot swap extensions to suit the shooter's needs without needing to take apart the entire assembly. Features: Lightweight, drop-in design. Durable stainless-steel construction QPQ black coated 2 magazine button sizes to choose from