Until now, muzzles have not been discussed in-depth. While they have been alluded to a few times, it is time to dig a little deeper. First things first, there are two types of muzzles. You either have a closed or open muzzle and both have similarities and differences. What is interesting is both configuration methods can accept one or two bands. But, with a closed muzzle, there is a small tunnel that the spear passes through to keep it in place.
This leads to the huge difference between the two; that being the loading process. Due to the aforementioned tunnel of the closed muzzle, the back end of the spear has to be inserted into the muzzle first then guided into the trigger. With an open muzzle, the back end does not need to be inserted through the muzzle (making it quicker most of the time).