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Ancient Gaseous Emanation
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55,669 Posts
The barrel must be a minimum of 18".
The overall length of the gun must be a minimum of 26".
 

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Premium Member
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15,424 Posts
I've seen these types of accessories before, but as a home made add-on with an 18" bbl. The one on the bottom would definitely be NFA, having a 16" bbl.

I never liked handling the M16 with the grenate launcher because of the weight and bulk. Adding an 870 underneath wouldn't be any more pleasant, IMO.
 
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