For the lucky few of us PEQ-15 users out there...
Depending upon who's data sheet you read, the L3/Insight ATPIAL AN/PEQ-15's IR-lo setting is either 0.7 mW or 0.6 mW which means it would be considered Class 1, or on the very low end of Class 3a. I've seen it listed both ways on technical data sheets so it's that close. Either way however, the low-power lockout ensures a real-deal PEQ-15 IR laser remains in this regime at all times and is considered eye-safe under normal circumstances. (ie. Normal means avoiding prolonged continuous direct exposure...key words being "prolonged", "continuous" and "direct")
For everyone else...
To use anything else but a stamped/certified real-deal Class 1 or 3a laser emitter (see Bean's post above) means you will be using it alone in the privacy of your own home and
not on any airsoft field. Though I don't speak for game hosts, I would
hope that if caught, failure to comply with this necessary safety measure would grant you an immediate and indefinite ejection/ban from games, a public shaming here on ASC, and possibly further sanction. Eye safety is serious $hit people so give it the respect it deserves!
Now save your pesos and go buy from Rampart and be safe...
'Fly