SIG Sauer MPX-K Sportline AEG Airsoft Rifle Licensed by SIG Sauer Lightweight polymer construction Velocity: Up to 300 FPS Weight: 3.7lbs Metal gearbox Folding stock Adjustable hop-up (located under dust cover) Fire mode: Semi and full auto Full-length top Picatinny rail M-LOK handguard 100 round mag Ambidextrous mag release Threaded: 14mm counterclockwise Motor: Long type Length: 15.35 - 23.42 inches