The Umarex H&K Licensed MP5A4 features a 3-round burst function that is paired with the famous VFC self-shimming gearbox. Available at Airsoft Megastore.
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Airsoft GI Uncut - Umarex H&K Full Metal MP5A4 AEG Airsoft Gun (3 Round Burst/by VFC)
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H&K Elite Series MP5A4 Airsoft AEG Rifle w/ Avalon Gearbox by Umarex / VFC (Model: Gun Only), Airsoft Guns, Airsoft Electric Rifles - Airsoft Superstore