Yep. both the original 30/60 PTS PMags and the newer 30/120 KWA mags have the mag cut off feature.
Having owned a TMRS, 2 BOLT B4 M4A1s and 2 KWA PTS ERG M4s, I can say although they each have their good points, I've preferred my KWA ERGs by a mile. The TM is awesome but I find the KWA PTS ERG is just so solid and reliable. The BOLT was nice and had a cheeky little kick to it but never felt substantial enough although I used one for about 3 years stock without issue before it died (stripped gears). I currently use another ERG Block 2 that is awesome if a little heavy with the DD rail and an Elcan on it.