These look any good? (magwellgrips)

[Coop de Ville]

http://www.makosecurity.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=MWG&Category_Code=Other

http://milspecmonkey.com/weapons-page/accessories/318-sixell-innovations-never-quit-grip

I grip the magwell and recently read a thread where a shooter had a kb and the magwell was damaged... leading to possible injury.

... am I worrying about super low odds?

-Coop