Are Magpul accessories for both airsoft and real ar-15 rifles?

I have a real AR-15 that I want to put some Magpul accessories on. Specifically MBUS sights, collapsable stock, grip, etc. I have been looking on E-bay for some used stuff and I see a ton of stuff for airsoft guns. Are the accessories the same for both? What is the difference? Some stuff says Magpul style,... show more I have a real AR-15 that I want to put some Magpul accessories on. Specifically MBUS sights, collapsable stock, grip, etc. I have been looking on E-bay for some used stuff and I see a ton of stuff for airsoft guns. Are the accessories the same for both? What is the difference? Some stuff says Magpul style, others say PTS(Professional Training and Simulation) Will it work as long as it is mil spec? I can't seem to find any info on Magpuls website.
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