SURE! Tromix built an over under AR-15... pretty cool looking. Not sure if the pix are still on the Tromix website... but it was built. The Siamese AR or something like that...
Anything that does not violate the laws of physics is possible, as long as you have sufficient money and time. However, just because you can, doesn't mean you should.
Possible? Sure.
Expensive? Absolutely.
Useful? Highly unlikely.
Practical? Certainly not.
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