Since when did it matter what the base cost of a firearm is? I've got 800+ in an 870, over 3K in an AR and a $800 plus 10/22. Nobody ever accused me of being bad for the economy!
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I run one of these on a mossberg with a magpul forend. Let’s me mount a sling to the bottom and add a light at the same time.
http://www.cdmgear.com/lightmounts.html
eta: attached the the barrel ahead of the forend...