If you remove the trigger pin you need a slave pin to put it back together easily. Normally the pin is removed from right to left. As in, they normally flare the left side of the pin. If you do remove it, it's not a big deal to reuse the pin, just make sure you seat it fully when putting it back in. They can be quite tight though and a good starter punch is a good idea to break them free. If you aren't going to be using it in IPSC I'd recommend the Cajun Gun Works trigger pin. It's held in place by the trigger spring.