Ichijin-daichi - Resubmit
You really don't need them to have w/ 1k combat for the initial prereq. Pump fort up to 4k and include Senkoutaihou. It's in the feat, and thematically fits, so why not make it a requirement to have? If you don't have it, then Toki the AH (example) could just pick it up and have no idea it's supposed to be used with Senkoutaihou and now the feat is no longer about dodging attacks and maintaining battlefield control, but just tanking hits and shooting people out of their combat range.
Bunkiten needs a range. Given the cost I recommend 5m, just like Tenonai. The bonus to your version is that whereas Tenonai is from the fist, yours is from bullets shot in a 10m cone. So.
Buntai needs a cost, otherwise the effect of the stun could be assumed at the output just from the bullets (without added abilities from AH mechanics), and that can get a wee bit ridiculous.
Bunketsu is just ridiculously overwhelming and can pretty much shuts down the entire hakuda tree for 2 rounds. This is a no go for what should be obvious reasons. I realize this is the final attack and should have some potency to it, but a single round after someone is hit should be more than enough to ruin their day. Either that or reduce the cost paid into the attack (thus the following effect). If you meant for this to follow decay rules (which I can't imagine you did) let me know and we'll talk more.
You really don't need them to have w/ 1k combat for the initial prereq. Pump fort up to 4k and include Senkoutaihou. It's in the feat, and thematically fits, so why not make it a requirement to have? If you don't have it, then Toki the AH (example) could just pick it up and have no idea it's supposed to be used with Senkoutaihou and now the feat is no longer about dodging attacks and maintaining battlefield control, but just tanking hits and shooting people out of their combat range.
Bunkiten needs a range. Given the cost I recommend 5m, just like Tenonai. The bonus to your version is that whereas Tenonai is from the fist, yours is from bullets shot in a 10m cone. So.
Buntai needs a cost, otherwise the effect of the stun could be assumed at the output just from the bullets (without added abilities from AH mechanics), and that can get a wee bit ridiculous.
Bunketsu is just ridiculously overwhelming and can pretty much shuts down the entire hakuda tree for 2 rounds. This is a no go for what should be obvious reasons. I realize this is the final attack and should have some potency to it, but a single round after someone is hit should be more than enough to ruin their day. Either that or reduce the cost paid into the attack (thus the following effect). If you meant for this to follow decay rules (which I can't imagine you did) let me know and we'll talk more.