I haven't belonged to a rifle range since 2008 but when I did, I had stands make of 1x2s I took with me. Thicker heavier wood might be easier to work with but 1x2s are cheaper and lighter and strong enough. The base could be made like Mongoose's design where the upright slips into the base. That might mean the base should be 1x4s. They will not withstand hits well but would be cheap to repair or replace. I used them with powder burners so there was no practical way to make something that was both portable and would survive.
At home I put small traps on either a brick column with a concrete paver on top or on a portable stand I made out of an old brake rotor and a piece of pressure treated 4x4. The 4x4 column has taken a lot of hits but is still usable. The brake rotor is heavy enough to make a sturdy base. You'd need an inexpensive source of brake rotors or drums but they don't have to be usable on a car to work for this.
At home I put small traps on either a brick column with a concrete paver on top or on a portable stand I made out of an old brake rotor and a piece of pressure treated 4x4. The 4x4 column has taken a lot of hits but is still usable. The brake rotor is heavy enough to make a sturdy base. You'd need an inexpensive source of brake rotors or drums but they don't have to be usable on a car to work for this.
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