ran it today with .078 on the port and it cycles perfectly now, even ran some very low pressure tula 55gr no problems.
ran the thermelt 20s i got from CNDD last year for $4.64 -- no jams or miss feeds but the thermelts would not work the bolt hold open .
with the troys or the 30 rd c-products the BHO works fine so it has got to be a mag thing.
accuracy seems pretty good , i am going to put some kind of optic on it , i'll try to find something that don't look too out of place on a early 1960s commando 605--
you all would be shocked how easy it is to use this barrel on a a1 kit build--LOL
those FSB.gas blocks are so easy to drill and tap if you got some good bits and even a HF drill press--
the old thing looks cool as hell with the nam era stock and triangle HGs--
maybe SMG will get ESS to crank out a few 20" one day--