stopped and got some more weights today. picked up 2-2.4 oz, 1-12 oz, and the bolt weighed 19.2 oz per scale at ups store. haven't decided how to place or which to use yet, but here are some ideas.
this pic shows length difference from pistol to new ones.
these would add almost 5 oz to bolt.
or this one could be welded to the end of bolt and slotted to accommodate the fp and guide rod.