Canuck Defender Foreend compatibility?

Cridler

Regular
Rating - 100%
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Location
Brantford, ON
Can someone tell me whether the forend on the Canuck Defender/Regulator can be replaced using mossberg 590 or Rem 870 parts? I know an adaptor is needed to replace the stock with one from an 870, but have no idea about the front grip.
 
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