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No - I'm talking about a retrofit. Some units do not buy a 416 - just the upper receiver so the rail system fore end will not look any different I would suppose. What *might* look different is the OUTSIDE of the upper receiver. Sure - obviously the INSIDE has a piston - everyone knows that. But we're talking about airsoft, not the real gun - will the OUTSIDE of the upper receiver look significantly different, or can an M4 airsoft gun pass as one of these real-life retro-fitted M4s with an M416 upper receiver?
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