I tried 5 different iterations before I settled on the final product.
The final result was a piece of 2” PVC electrical conduit, split, heated and moulded for the handguard, then trimmed to fit. I then stippled the plastic with a soldering iron. The transfer bar is a piece of alluminum angle iron epoxied and screwed to the pump.
A second transfer bar would block the ejection port, so a single will have to do.
I’ll take some better pictures tomorrow and do a bit better write up, but all told I ran 2-300 rounds with 1-4, and I’ve only run 150 rounds with V5, so it’s too soon to speak about reliability etc….