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Any AR in the hands of another Canadian is good for us and it's his rifle, he can do whatever he likes. I wouldn't take that to the range though, looks wrong.
Reminds me of all the action movies from the '90's where the dudes all have MP5's with scopes as long as the gun that really help during hip-firing. But to each his own, if he likes it and it works, than fine. Personally not for me though.