Re: Entry 556, 14.5 barrel Surpressor Recommendation
The Mini suppressors are all too loud if you are going to be letting officers shoot the system without any ear protection. Truthfully there is no 5.56 silencer that is truly "ear-safe," but the full-size silencers are a lot closer to this goal than any of the very small cans on the market.
I think you would be well served by the AAC M4-2000 mentioned above. Its internals are 100% inconel (a nickel-based superalloy which will take a FA beating), it is relatively light and small (not THE lightest or THE smallest, but competitive on both fronts), and it is among the quietest 5.56 cans on the market. I would not buy a titanium silencer for a short-barreled machine gun, it is not nearly as durable as inconel even if the manufacturer does "rate" it for FA use.
ETA: The AAC Ranger 2 is also a good silencer as noted above, a bit lighter and smaller than the M4-2000, but it also lacks full-inconel internals and is substantially louder than the M4-2000 (it has only 3 baffles, compared to 7 in the M4-2k).