FN Scar-L Spring Powered Airsoft Rifle, Tan, 300 FPS - High Speed BBs
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Jing Gong JG M4 RIS System Airsoft Gun 500 FPS - High Speed BBs
Amazon.com : 275 FPS Fully Automatic Electric Airsoft AEG Rifle SMG Airsoft Submachine Gun with Battery, Red Dot Scope, Flash Light, 6mm BBS, and Shooting Target- Great for Starter and Gift :
Airsoft BB Velocity (FPS) vs Spring "Constant" : r/airsoft
Lancer Tactical LT25 Gen 2 Interceptor SPR M4 AEG Airsoft Rifle Low FPS ( Option )
KWA Full Metal QRF Series AEG 2.5 Airsoft Rifle PDW w/ Adjustable FPS | AirsoftNMore.com