These target systems are awesome!

They work with standard medium duty T POSTs, find them at your local hardware store for a couple dollars. Essentially this is going to sit on a T POST after you put it together. Assembly takes 2 minutes. It is a large single piece of AR500. It bolts to a T POST bracket that we have designed with a 1/4" AR500 front plate for excellent bracket protection. You will bolt it to the T POST bracket with grade 8 bolts, 5/8". They are monsters, but work great. Simply put the HD SS compression spring in between our custom bracket and AR500 plate. Then go beat the crud out of it.

We created these targets for a few reasons,

It really allows the target to move a lot, but still come back quickly to the starting position with the HD springs.
It makes the aiming point over 2 feet high, making target failure almost impossible. Which results in a lifetime of use.
It rings super loud when hit! It utilizes the easy to get T POSTs and they are compact and easy to set up!