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![[MadDog] M4/M16 AEG Airsoft Upper Receiver[BLK]](http://www.asiaairsoft.com/cdn/shop/products/Maddog_M4A1GBBRifleUpperReceiver_1_1024x1024.jpg?v=1627361590)
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![[MadDog] M4/M16 AEG Airsoft Upper Receiver[BLK]](http://www.asiaairsoft.com/cdn/shop/products/Maddog_M4A1GBBRifleUpperReceiver_1_480x480.jpg?v=1627361590)
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