King Arms M700 Nozzle
Okay, so there's the big hub-bub now about Tanaka's removal of the PCS bolt from all new M700 rifles to comply with new Japanese laws. It's a real shame. And on top of that, they've placed a restricted nozzle on all their new bolts, limiting the gas output, which keeps the velocities... well... pretty crappy.
King Arms saw the need for an unrestricted nozzle. And while they were at it, increase the bore a bit more so that even users with a PCS bolt could get a further performance boost (assuming you already had your valve cranked wide open and wanted even MORE velocity...)
So I brought in one of these valves just to see what difference it had.
Note: I'm lucky enough to have a PCS bolt in my AICS.
First thing I did was mic it up. Pulled out my trusty Starrett digital calipers and gauged the inner bore of the King Arms part. (No, I don't have a bore gauge, but this should do for a rough idea on differences).
King Arms bore diameter: 4.725mm
Tanaka bore diameter: 4.560mm
I'm actually unable to figure out how to remove the nozzle from the bolt... and I'm afraid to take pliers to it. If I ruin my PCS bolt, I'll cry. So for now, I'll leave this review at that. If anybody has any suggestions on how to remove the nozzle, I'm all ears.
But from what I know of gas systems, bigger bore = higher velocity, at the expense of greater gas consumption. This part *should* do what it claims.