Nice to have a spare part on hand in case it doesn't work. I know it always makes me more comfortable with files, dremels and cutting torches.
Now the most important step will be to practice - Shoot, reload, shoot, reload, holster, draw, shoot, reload, holster, sit down, stand up, fight, fight, fight ... oooooops ... wrong game, shoot, holster ...
Keep using it and using it in practice to assure that it works first time every time!