I have a buddy who's a sniper in the Marine Corps, and his guys run a few KAC M4QD's and a few Halos, and he said that the Halo would loosen for him and pissed him off.
I think this may be a problem of different dimensioned A2 FH's. Maybe if the A2 FH is undersize it's more of an issue. These aftermarket devices are more close tolerance as most are CNC machined parts.
It could also be mounting procedure. I visited Phil and he told me they advise people with thread mount cans to tighten the last 1/3rd to 1/4 turn briskly to get more torque into the system. It sounded sound, and maybe that's how the HALO mounts properly.
I doubt water would hurt it. It will rust some but in any firing water vapor is deposited due to condensation of the humidity in the compressed air. The key is not to be a complete dumbass and fill the silencer with water (water doesn't compress, so it can burst the tube), only a teaspoon of water is advisable, and the Halo is a conical baffled silencer so you should add it from the muzzle aperture, lift the gun at a 45-60degree angle momentarilly and let some water hit each chamber, rather than adding it to the rear of the silencer where all the water is increasing pressure in the expansion chamber where pressure is greatest. Storing with a teaspoon of water is a bad idea, so really this is something to save for a real operational need like snipers in a hide who want to take a shot without a first round flash. The first round from any silencer will flash at least a little.
Pistols are lower pressure so more crap can be tolerated than with rifle silencers.
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