Does it come in a box?
What poundage trigger pull does this pistol have?
Around 4 lbs
Can the grips be replaced with regular 1911 repro grips?
what is difference between this and a Tanfoglio Witness?
It is all exterior differences. Finish, grips, markings, etc.
Are the grips made of wood or plastic? Also, who actually makes this? It's branded as 'Air Venturi', but it sure looks as if KWC is the manufacturer.
They are plastic. Manufacturer is KWC
Does this gun work with the colt 1911 magazines because I have a lot of extra magazines for other 1911s I have the colt, black water, Remington , Swiss arms will these magazines fit this gun
Assuming you mean commander mags, then yes. You'll notice that the vast majority of those other branded mags are listed in the recommended accessories section as well as the specifically weathered mag that goes along with this John Wayne model.