Just as a sidenote, the "Marui" buffer tube is mil sized, and a real CTR fits just fine (I have/use one).
The PTS plastic (as used in the MIAD grip) is regular, decent-quality (by airsoft standards) ABS; the CTR is some kind of denser polymer. Most notable is the colors don't quite match up with the real steel parts, specially FDE.
Quote:
Originally Posted by turok_t
1. Magpul PTS CTR
2. Magpul PTS MOE
3. Magpul CTR (mil spec/commercial)
4. China clones of the above
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Also there's PTS MOE and "Mil-Spec" MOE, and everything MOE goes for the same price as its PTS MOE counterpart, so I'm not sure if they're any different or just marketed as PTS to skirt around ITAR restrictions. I know that, at least for the handguard, the PTS version is marked "PTS" while the "milspec" version is marked "MOE."