Okay I have to point this out but the o-ring on the rages doesnt have to roll back on the arrow to show that the thing opened the whole point of the o-rings is just to hold the blades in place until impact. On impact the o-ring acts like a shock absorber staying in place absorbing shock when it hits bone.(This is on their website by the way) So to all of the people trying to use the o-ring not rolled back on the arrow this is an invalid excuse. And to top it off the o-rin on one of our rages last year was still in position after going thru a doe. Just letting everyone in on this little secret.