That wholly depends on the number of characters you have and straight up perseverance.
You can either find the weapon, as a reward from XH trigger being completed or you can trade in 20 material zero for it when it's in the rotation.
1 character can earn a maximum of 10 material zero from achievements and they can also drop as a result of SH/XH trigger completion. However, the first 5 are the easiest ones to get, since you get 1 material zero for each of the first 5 triggers you deploy and complete. After the first 5, the next 5 are for every 5 triggers completed. In terms of efficiency, you would ideally have at least 4 characters, each clearing off 5 triggers each for the 20 matzeros you need.
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