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.
HK MP5 A5 Competition 9mm Kit - AEG – Airsoft Atlanta
Umarex Licensed H&K Full Metal MP5A5 3-Round Burst Airsoft AEG Rifle
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What are some cheap high quality airsoft brands? Is Heckler & Koch a good brand? - Quora
Umarex MP5A4 AEG Airsoft Rifle (by VFC)
Hk Mp5 A4 Aeg Airsoft Rifle
Umarex Licensed H&K Full Metal MP5A5 3-Round Burst Airsoft AEG Rifle
Elite Force HK Heckler & Koch MP5 A4 Elite Series AEG Automatic 6mm BB Rifle Airsoft Gun : Sports & Outdoors
Elite Force HK Heckler & Koch MP5 Competition Kit AEG Automatic 6mm BB Rifle Airsoft Gun, Black : Sports & Outdoors