Armaspec TCB-31 Extended Magazine Release Bronze. The TCB increases the size of your factory button by 263percent making it easier and faster to perform magazine changes. The size and ergonomic design enables button engagement without changing your grip position. Specifications for Armaspec TCB-31 Extended Magazine Release: Manufacturer: Armaspec Gun Make: AR Platform Gun Model: AR-10 AR-15 Fabric/Material: Aluminum Weight: 0.18 oz Condition: New Country of Origin: USA Features of Armaspec TCB-31 Extended Magazine Release Faster magazine change 263percent larger than Mil-Spec mag release button Compatible with Mil-Spec AR-15 lower receivers Ergonomic design made in specialized factories Lifetime warranty Package Contents: Armaspec TCB-31 Extended Magazine Release What firearm models does the manufacturer say Armaspec TCB-31 Extended Magazine Release is compatible with? The manufacturer suggests that Armaspec TCB-31 Extended Magazine Release is compatible with AR-15 AR-10Armaspec ARM103-BRZ: TCB-31 Extended Magazine Release Bronze