Really if you buy this and you have a halo once you (if possible for you) put the hopper in the feedneck then you wont need the clamping and will probably never get it out. It holds it so tight. An eggy will slip in and out. I would recomend this to a person with an eggy.
Conclusion:
Its good but depends on the hopper. But it does job so ill give a nine.
