It has a quick spring change system and the spring guide

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Atlas Custom Works KAC QD Mock Silencer w/ SR16 Flash Hider emg f1 bdr It has a quick springSpecifications Construction: Aluminum & Steel Threads: 14mm Negative Length: 6. 6 inches Color: Black Features CNC aluminum alloy mock suppressor construction with a full steel flash hider Mock heat shield gives the mock suppressor an aggressive look Easy to attach and remove design via the QD quick detach system Includes a 14mm negative SR16 style flash hider that attaches onto the mock suppressor. Package Includes: 1x Flash Hider, 1x Mock Suppressor