Get the sparroww SS for sure, Pm silenced america aka Killbox.
The cenetrfire, is gonna take some additional info. Tell us about the rifles you want to use it on (specify the acion: bolt vs semi-auto), tell us how fast you want to shoot, how far you intend to shoot, the barrel twists of you guns, the threading your guns have, if thier not threaded they better be heavy barreled, whats your needs on accurcy, how long are your barrels.
copy and paste this:
Rifle 1: Name and Model
Action: bolt / semi auto
Modifications made or accessories attached:
BBL length, twist, threaded: ##", #:#, Y/N
Rate of fire: ever any need of fast / rapid while suppressed: Y/N
Accuracy needs 1-10 ( 1=lowest [spray and shoot], 10= [one hole miracles]): #
Percentage of use: Hunting: ##%, Target ##%, Ammo Dumping ##%
do you plan on using sub sonics: y / n
pate the above for rifle 2 and so on.