Longer answer:
That said, I believe that the SI bow is not REQUIRED to do the bow series in R10 (at least I never saw the red triangle in the weapon window, just the yellow one). You can use a rifle or an AR. You will get a message saying that This Hunt Will Be Difficult blah blah blah. For HR 4 you will need it.
However, you may not be able to complete some of the hunts without the bow since there are several hunts that really need the suppression and your other bows are not powerful enough if you have not done HR3 yet.
Comments
Longer answer:
That said, I believe that the SI bow is not REQUIRED to do the bow series in R10 (at least I never saw the red triangle in the weapon window, just the yellow one). You can use a rifle or an AR. You will get a message saying that This Hunt Will Be Difficult blah blah blah. For HR 4 you will need it.
However, you may not be able to complete some of the hunts without the bow since there are several hunts that really need the suppression and your other bows are not powerful enough if you have not done HR3 yet.