37 MM launchers

[rickyp]

I am thinking about something and wondering if i is even legal before I start to move on with the project I am thinking about getting a 37mm launcher and having it registered as a D.D. then once done get a 12 ga shot shell adapter or two.( then may be 12 ga to 20 and 410 adapters shot all the shot shells I have) What I am thinking about doing is mounting it to the bottom of my 20" 22 LR ar 15 and use it for hunting small game, That way I can use the 22 LR for longer shots and the 12 ga for close shots. would it be legal to hunt with such a set up in Southern MD [/t][/c][/t]    [/t]