Yes, mine has a threaded barrel. Now with a flash suppressers, it came that way.
Erik makes suppressers for many calibers.
When I was at his place the last time, he showed me 2-.223 prototype short barrol rifles he had made.
One had a puppresser on it. A very KOOL l@@king rifle. Even without the puppresser, its still classifed as a machine gun, because of its short barrol. It must be registered it as a machine gun and pay the one time charge of $200 to the Treasury Departments, BAFT.
He also takes Ruger 10/22's and puts suppressers on them or bring yours in and he'll add it to yours.
They would make for not much of a sound heard shooting, even in a city.
Years ago while living in CA. A machinest friend of mine make me a puppresser for this gun.
I have the pistol one with 6 and 12 inch barrols...hehee...
http://www.henryrepeating.com/rifle-survival-ar7.cfm 
Any clod can have the facts, but having opinions is an art. - Charles McCabe
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