Shock is the least accurate of the three, albeit only by less than an inch difference at 20 m distance. G-spec is shortened version with a silencer attached. Inner barrel is 303 mm long, but has a slightly tighter bore. Due to short inner barrel its accuracy is close to Real Shock, but a couple mm more accurate. A needle-like contraption called air brake protrudes from the piston. The air brake plugs the cylinder before piston impacts, trapping a small amount of air between the piston and cylinder. This reduces impact vibration and adds to VSR series' unique accuracy. VSR-10 Pro-sniper version VSR-10 Pro-sniper version Tan VSR-10 Pro-hunter version VSR-10 Pro-hunter version Black VSR-10 Real Stock Version Wood VSR-10 G-Spec VSR-10 G-Spec OD L96 AWS Black L96 AWS OD M40A5 Black M40A5 OD Air shotgun and air rifles Tokyo Marui makes several replicas that are powered by compressing a spring. For the shotgun and grenade launcher models, each shot fires three BBs at a time. M3 Super 90 M3 Shorty SPAS-12 SPAS-12 (Discontinued) Metal Stock version M203 grenade launcher for M16A1 and M16A2 M203 grenade launcher for M4A1, M4A1 RIS, and Knight's SR-16 Tactical launcher, an M203 with stock and pistol grip for standalone use XM177E2 M16A1 MP5A3 Uzi SMG Heckler & Koch G3A3 Walther MPL Kel-Tec KSG Walther MPK (Discontinued) Spring Pistols The spring is compressed by racking the slide. Some have hop-up and some do not. HP Browning Competition (Discontinued) Nambu Type 14 (Discontinued) Walther P38 (AMC) .44 Auto Mag (Springfield Armory) Omega 10mm Auto Colt M1911A1 Government (Smith & Wesson) M645 Desert Eagle (.44) SIG P228 High Grade Glock 17L High Grade Glock 17 High Grade (Ruger) KP85 High Grade H&K P7M13 (AMT/IAI) Auto Mag III High Grade S&W PC356 (Beretta) M8000 Cougar G (Colt Mk IV Series 80) Centimeter Master (H&K) SOCOM Mk 23 High Grade (Named one of the best spring pistols ever made.) H&K USP High Grade CZ 75 High Grade Colt Double Eagle (Beretta) M92F Military Model High Grade Biohazard Ashford Luger Model (Limited Edition) AMT Hardballer Browning Hi-Power Competition (Discontinued) Colt Python (Black or Silver) P08 Luger (Discontinued) Colt Single Action Army (Black or Silver) Gindan Pistols Tokyo Marui makes a small series of semi-automatic guns that fire by compressing the spring and releasing it as the trigger is pulled. These are mostly marketed at children in various colors, but Tokyo Marui