All righty then. I made an Oni-spawn Tiefling Shapeshifter Ranger, with the Claws form of the Maw or Claws alternate racial class feature. So he starts at lvl 1 with 2 claw attacks. My next 2 lvls are Alchemist giving me my 1st Discovery and my lvl 3 feat, for which I choose Vestigial Limb and Extra Discovery-Vestigial Limb. Still have just 2 Claw Attacks.
At Lvl 4 I get my 2nd lvl of shapeshifter Ranger, which gives me Aspect of the Beast (Claws of the Beast) which says I gain 2 Primary claw attacks. It doesn't specify where these 2 extra claws grow from( ie. fingertips, toes or bone spurs from my butt cheeks), but for flavor I put them on the hands of my 2 Vestigial Limbs as I am stylizing my character after a girallon.
Then I am told I can't do this because the Vestigial Limb description says that they never grant extra attacks, even though its the aspect of the beast feat that is granting the extra 2 claw attacks. So to Sum up:
Level 1: 2 arms, 2 claws
Level 3: 4 arms, 2 claws
Level 4: 4 arms, 4 claws
As far as I can tell using RAW my build is legal. So aside from people just not liking my ability to stay on par damage-wise with an archer, but using melee, does it sound PFS legal?