It's worthwhile to have a few spare parts in your range bag and an extra mag catch lock and spring can save your day if you loose your original for some reason. Customers have had me fit more than one style of magazine catch to their pistol to make it serve multiple roles. I always send the mag catches dressed out with springs and locks fitted to the pistol.
These locks are made from barstock, have USGI style slotted heads and are finished in stainless steel. Supplied with Wolff #2 mag catch spring.