I like both the Plinker jig and the bolt cutter rivet tool. (bcrt)
BOTH will do a very nice job.
However I prefer using the bcrt.
It is easier as it requires no setup.
In the time it takes to get 1 rivet done (mounting, setup of the receiver, setup in the press to dimple, un setup to do the rivets, then do it all again for the other side...
I will have all of them done and be halfway done pressing my barrel in.
Don't get me wrong, I really like the plinker jig and used one on my first two builds.
Then I used a BCRT and have not looked back since.
I really like your ball bearing stabilizers on your press ram's shelf.
I've gotta make that mod on mine!!!