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Replacement shroud tube and back plug.
Shorter one will fit all weapons that have 5-1/4" of barrel to cover with no obstructions
Longer one will fit all weapons that have at least 6" of barrel to cover with no obstructions
For the shroud to fit inside your hand gaurd/rail the opening of your rail must be at least 1-1/2" inside diamter.
We suggest the following for you gun as long as they meet the above specs also
Longer
Shorter
Sizing Tips Video
This shroud/base is an awesome piece and makes the MP15 22 look amazing. Make sure you read the description and lengths in RED. The 6 1/2" base will not fit under the MP15 22 rails. Make sure and go with the 5" version.