So you have to buy a Core Rulebook arrow shaft to go with the arrow heads of Run & Gun? Man, that could have been spelled out better. For example, a Rating 5 arrow with an Explosive head would be (Rating 5 * 2) + 15 = 25¥, and a Rating 10 arrow with an Incendiary Head would be (Rating 10 * 2) + 100 = 120¥?
I guess that makes it pretty easy in terms of the proposed Hawkeye quiver; buy 32 arrows (64 to 320¥ depending on Rating) and an unspecified amount of arrowheads. Such a quiver should probably be able to hold an equal amount of arrow shafts and heads, with normal arrows not needing to be assembled and optional heads simply threaded on top of the normal head somehow (insert logical reason here; I'd say the area right behind the normal point could be slightly threaded, allowing an optional head to be assembled right onto the shaft something like you see Hawkeye do in the Avengers).
Furthermore, should it take an action for the quiver to assemble the head and shaft? It's a Simple Action to Reload Weapon, which is required to both draw and knock an arrow, and if the quiver was wireless I could see readying the assembled arrow being no more than a free action. If it wasn't wireless, I could see the assembly taking the equivalent of a Simple Action, meaning you'd have to issue the command as a simple action, ready the arrow as a simple action, and fire the bow as a simple action. Certainly would give the wearer an incentive to enable the wireless protocols.
Making some assumptions from the above, one could then end up with something like this:
Cavalier Arms Urban Tribe Auto-Quiver
This is not the quiver of your ancestors. Made from modern composites and featuring state-of-the-art technological advancements, the Urban Tribe Auto-Quiver represents an unparalleled advancement for the modern archer. Popular with Native American gangs and special forces both, the quiver is capable of assembling arrows at a moments notice by threading an arrowhead from its internal magazine onto an available shaft, ensuring the wearer is always equipped for the task at hand.
Capacity Avail Cost
32 10R 250¥
The Urban Tribe Auto-Quiver can hold up to 32 arrow shafts and heads in any combination. Preparing one arrow takes a Simple Action. An expeditionary model with a capacity of 48 shafts and heads is available for an additional 150¥.
Wireless Bonus: Assembling one arrow is a Free Action
Alternatively, the Wireless Bonus could be that the assembly of the arrow becomes included in the Simple Action to reload the weapon, freeing up the Free Action for other things.
An archer could for example carry 24 regular shafts (rating * 2¥ ea), 4 injection arrows (rating * 20¥ ea), and 4 static shafts (rating * 25¥ ea) for a total of 32 shafts, with 12 explosive heads (15¥ ea), 4 incendiary heads (100¥ ea), and 4 stick-n-shock heads (25¥) ready for assembly, firing either the normal Rating 5 arrow, normal injection arrow, or assembling a normal Rating 5 arrow into one of 4 different combinations (ex, incendiary, sns, sns w/static shaft).
Assuming Rating 5 for everything, that's (24*10)+(4*100)+(4*125)+(12*15)+(4*100)+(4*25)=1820¥. Just don't lose the damned thing, in other words!
I would probably allow injection arrows to be bought as heads for the normal price of the injection arrow itself (Rating * 20) minus the cost of a normal arrow of the same rating (rating * 2), resulting in a price of (Rating * 18¥), as this would allow an archer to carry a full complement of 32 arrows and 32 different optional heads, with the sole exception being the static shafts.