The SilencerCo ASR Blast Shield AC1548 are new.
The SilencerCo Blast Shield will not fit a Smith Vortex Flash Hider. The SilencerCo Blast Shield is only compatible with the ASR Muzzle Device.
No, the SilencerCo ASR Blast Shield will only fit to ASR muzzle devices like the SilencerCo ASR Flash Hider, found by using the link below:
https://www.opticsplanet.com/silencerco-hybrid-asr-muzzle-device-9mm.html
The LANTAC Dragon SilencerCo ASR Muzzle Brake will work with the SilencerCo ASR Blast Shield.
The outside diameter of the SilencerCo Blast Shield is about 1.5".
The SilencerCo Blast Shield does not come with an ASR mount. A variety of ASR muzzle devices can be found at the link below.
https://www.opticsplanet.com/s/asr-mounts?_iv_categories=muzzle-devices&_iv_brands=silencerco
it can be mounted to a .30 cal ASR Device
if you have an ASR Muzzle Device you should have everything you need.
The OD is just under 1.5
I have the combo, asr single port + blast shield and it measure 2 3/4 inches from the base of the single port threading and the tip of the shield. Not sure about the total length for other asr muzzle devices with the shield but based on the QD threading it looks like it would be the same but I do not know that for a fact. It's pricey but neat and easy to use.