B&T Rotex-IITM SMG/PDW suppressor, cal. 4.6mm x 30 The MP7 suppressor was developed by B&T in close collaboration with Heckler and Koch especially for the high performance submachine gun MP7. It is the perfect choice for this weapon and successfully in service with countless MP7 users for many years. These are a great match for our Upcoming T7 pistols and are a direct fit. These are an NFA item, We will need your Dealers FFL and SOT for the Form 3 transfer to them so you can start your Form 4.