Legality of an Upswept Palm on a Rink grip?

Rink offers an special upswept palm for their orthopedic grips, the indicate they are legal for NRA Bullseye, although I have heard suggestions they might not be?  Is there a consensus?

Grips with upswept palm rest

For the NRA(US)-discipline "Bullseye" we provide grips with a special upsweept palm rest. The “horn” prevents the hand from slipping from the grip.




All ISSF-grips (if manufactured by us), can be refitted with our upsweept palm rest:

Completely legal and used at Sectionals, regionals, and nationals regularly. The relevant section of the rules:

 3.6 Grips - The grip, or any part of the firearm, may not be extended or constructed in any way which would give any support beyond the hand. The wrist must remain absolutely free and visible when the pistol is held in the firing position. No part of the grip or accessory may encircle the hand (see Fig A). Upward curvature of the heel of the grip may not exceed one inch as shown in Fig. A. Adjustable Grips are permitted as long as they conform to the dimensions as shown in Fig. A.