I have just received 4 of the last Gemtech Viper 45 Suppressors that Gemtech will ever make and they are available for sale now. These are only available because I personally wrangled for weeks with S&W to get the last inventory of Vipers released to the public and once they're gone, they're gone, as S&W has confirmed that they won't be making any more. These Viper 45s are brand new in box and include the locking collar mount for your MAC and in my opinion are the best looking and functioning suppressor for the M10.
They will transfer to your dealer on a Form 3 and I eFile, my transfers have recently been getting approved in ~48 hours.
Asking price for each Gemtech Viper 45 is $795 which includes USPS Priority Mail shipping to your FFL/SOT. Certified funds only please.
If you'd like to discuss a deal for multiples, send me a PM.