There are two suppressors I'm aware of that used a gas seal. One was the SWR Renegade's SAI gas seal lock mount. This is probably with little doubt the unit you are referring to as having a pin that goes inside the A2 comp. The "pin" is a funnel shaped device that operates like a tiny air fitting isolating the mounting system from hot exhaust gases.
The other is a patented product that makes use of a collet locking system which is discussed in Neil Parker's book "Firearm Silencer Patents" (this suppressor is probably extremely rare to the extent that I don't know what company ever made it for sale.)
The more common Gemtech, AAC, SRT, and Coastal units do not have that gas seal feature because it is unnecessary for function of the suppressor and is more likely important to the proper function of some mounting systems. In the future we're going to be deleting the forward flash hider stop because it is also unnecessary to function and does reduce compatibility with other devices such as YHM Phantom in favor of slightly enhanced ease of mounting (which I believe is nice to have, but isn't as nice as overall compatibility with market accessories).
If the BC2.0 groove were to be moved forward .025-.030" and made to be .125" minimum width, the device would be most compatible with the greatest number of devices IMO. The OD is also a little on the tighter side at .863, but that is more of an opinion statement as some may like the mounts very tight and others a little less so.
The battle comp videos make the A2 and Battle comp performance seem very similar as it pertains to flash, while our testing did not suggest that. So in that singular respect, it appears that the BC units haven't realistically been compared to A2's.
I do think that there is a lot of room for these devices to be an effective improvement in law enforcement use where gunfights are short, often accompanied by tactical lights and small numbers of foes, and mostly at close distances where rapid incapacitation is most important, but not so much in military use unless accompanied by a sound suppressor for nighttime use.
These devices would probably also be well suited to close protection of executives and diplomats because of their primarily daytime hours of operation and threat conditions that probably nearly mirror those of law enforcement.
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