Who uses a tornado brush?

[Ben8553]

Have an m4 that's pretty fouled and I'm tempted to try a tornado brush as I've seen suggested before. I'm pretty wary though with the maintenance specs saying to not use any metal brushes on the bore. I do use a brass brush, but does anyone have thoughts on avoiding the stainless tornado brushes?

[SOCOMguy]

If you have not seen one .... a tornado brush is not like a normal metal wire brush. It is made with stainless-steel wire that is wound around the stem in swills so there are no sharp points touching the barrel from the wire. I use a tornado on all my shotguns and see no adverse effects. 

Just for info, your mileage may vary....

Joe B