This modification does two things:
- Disables the magazine interlock safety, so that a magazine is not require to change between SAFE and FIRE.
- Disables magazine retainer thingy that drags against the magazine when inserting and removing the magazine.
This modification if done carefully is easily reversible. When the safety is on SAFE, the trigger block and hammer safety functionality will still work as before. The magazine retainer thingy is actually the Safety Block that serves both of the above functions and will not be altered.
