Originally Posted by Indianajohns
Are the different versions of mechbox's standard for most airsoft guns or are you just talking about G&G? Cause I know that they're old internals weren't great but they've done a lot to remedy that.
Most types of AEG's use commend mechboxes. For example, M4/M16-based, MP5-based, and G3 based use Version 2. AK-based, G36-based, AUG, and SiGs (or at least the 553) use Version 3 mechbox. P90's and Thompsons use a Version 6. This is generally independent of the manufacture, although some companies like ICS use proprietatry mechboxes.