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There's 2 general types of M203, one hooks onto your barrel and you'll need to take out the bottom part of the handguard. Or there is one that attach to a rail system which you obviously need to replace the stock handguard with a RIS/RAS.
Which brand, you can read the reviews.
Long or short, depends what floats your boat, but long usually goes with the M16, and short goes with M4.
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