I've got my can now and it has made no noticeable difference to functioning with subs. Even with the standard carbine buffer and spring, it still would'nt strip fresh rounds.
I have ended up easing the gas port to 2.9mm and taking the weights out of the carbine buffer. Now it cycles OK with 9 grains of 2207 and a Sierra 220 MK.
To use supers, I currently have to change out the modified carbine buffer and spring, for the JP captured spring. Since I'd like to use the JP silent spring with subs, I will look for a low power (7 or 9 lb) 1911 spring. I used to have a couple but I let them go with my Para 1445's when I sold them... more fool me.
Ray.
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