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Angleport Kinetic End Cap for Rem 1100 ???

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I'm trying to find a little info on how well the Angleport Kinetic End Caps work. There available for Rem 1100, Beretta 390/391, and the Browning Gold.
If anyone has tried them could they give me there opinion of how well they work. Are they worth the $100 price tag and how they actually work inside.

Thanks in advance for your inputs