The one the OP made, allows cleaning from the rear, which is the recommended end to clean the bore from. I have the same mag well insert, that I chuck up in a vise, on my work bench and use it to support my AR.
I've used one of these from MTM the past few years...
MTM Portable Rifle/Shotgun Maintenance & Gun Cleaning Center
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Thanks,yep have a piece of felt glued on barrel restCouple scraps of 2X, some 1X12(?) a few brackets and some paint and you have made yourself a helluva rig there, nice work.
MacGuyver would be proud.
I can't see it in the pics, but I just bet you have some sort of soft padding where the barrel rests.