I just bought an AR Pistol that is capable of being silenced. Would the solvent trap kit be OK for this even though it uses a 5.56 rifle round? I've been told that the AR Pistol is noisier than a "regular" handgun or a rifle so a silencer would be a good addition. I haven't gone to the range with it yet. Heh, do I go to the pistol range or rifle range? I'll have to check with the indoor range to see if it's OK to practice there. They don't allow AR15's in the indoor range. Anyway, I would prefer to get a factory made silencer but they sure are pricey and having to wait "forever" for ATF approval is a bit of a deterrent. Also, I've heard that you can use an oil filter for a suppressor. It seems that it would be difficult to spec an oil filter on the form 1 if you want to try different oil filters. By the way, why aren't silencers quieter? In order words, why is the noise level still in the danger zone?
ok, lots going on here. i'll try my best to answer your questions...
for the AR pistol, you use the rifle range if you are using a centerfire rifle round, use the pistol range if your caliber is a pistol caliber.
as for solvent kits.... they are like 80% firearms. they do not have the holes needed for a bullet to pass through. you have to file and get approval of your Form 1 before starting any drilling.
as for a normal suppressor.... you go to a special FFL and buy a suppressor. you pay purchase price, sales tax and $200 NFA tax. you do not take possession of suppressor until the Form 4 comes back to the dealer and fill out a 4473. i would suggest buying a can that is in stock and have your trust, fingerprints and other paperwork ready to go.
oil filter suppressors are illegal, unless correctly registered with the ATF. IMO they are not good at all and don't last very long.
finally, suppressors suppress the noise, but do not silence it. this isn't the movies, its real life. you will probably still need ear plugs. the best suppressed caliber is probably 22LR out of a 4.5" barrel.