Variation on a theme. This one is fairly short to keep the wind from rocking it and if the wind kicks up a sandbag or such placed on a crosspiece keeps it stable. Like yours everything is just press fit together for ease of replacing parts - anything downrange
will get hit eventually.
For transport the top is pulled out of the bottom.
I like the rails on yours to slide backers in and out, mine are screwed/bolted onto the frame but a backer lasts up to a thousand or more shots so they don't have to be replaced too often, and even then it's a five minute job.