I am a firearms instructor for Mass State Parole and we hopefully be starting to introduce this into our officers during their recerts this year. I purchased one last year for myself and allowed officers to try the device in their own weapons during scenario training, the opinion was overwhelming, it was a big hit ! They render the weapon totally intert, highly visible for verification and they allow the officers to use their own weapons and holsters which is so much better than the generic red gun. We have Sig Sauers, they fit perfectly and allow the weapon to be used realistically. They are extremely inexpensive in comparison to a red gun and are very durable. They are a must for any Dept., they can save your training budget plenty and enhance your realistic training.