More Accuracy, at 30m shooting range test it shows result with 20% less dispersion compare to original factory airsoft gun.
Further Effective Range, with our hop up bucking it easily reach over 60m distance straight without falling.
Much Stronger Durability, with high quality Stainless Steel 304, it's much more durable compare to other copper inner barrel.
High performance NBR Rubber, give more spinning than other materiel, Which mean effective shooting range can break 60m easily with heavy bbs (0.4g or heavier).
 
AEG and Spring powered version is coming
 
【Each brand /gun type - inner barrel length list】
【Size conversion】
10.5"....265mm
11".......275mm
12.5"....320mm
14.5"....370mm
16".......407mm
18".......455mm
20".......510mm
【GHK】
《M4》
M4 MOD1、M4 10.5"...265mm
M4 12.5".....................320mm
M4 MOD2、M4 14.5"...370mm
《AK》
AKS74U.......245mm
AK105.........320mm
AKM、AIMS、AKMS、AK74、AK74MN...407mm
RPK.............580mm
《G5》
G5..........200mm
G5 12"....300mm
G5 16"....407mm
【WE】
M4/RIS.......370mm
M4 CQB......275mm
R5C.............215mm
416C...........245mm
SCAR...........260mm
小米7...........200mm
T-91.............393mm
AK PMC.......420mm
M14.............510mm 
M14 EBR......440mm
PDW 8".........230mm
PDW 10".......275mm
G36C............240mm
G36K............340mm
G36E............500mm
MP5 A2/A3....215mm
MP5K.............112mm
MP5 SD..........322mm
L85................465mm

【KWA】
AR15 MEGA 14.5" (GBB)...370mm
KTR-03 (GBB)........440mm

【VFC】
M4A1 (GBB).............380mm
M4 RIS (GBB)...........380mm

VR16 RIS II (GBB).....................380mm
VR16 CQB II (GBB)....................275mm
VR16 SABER CARBINE (GBB)...370mm
VR16 SABER CQB (GBB)...........229mm
VR16 SABER VSBR (GBB).........208mm
416 V2 (GBB).......370mm
416C (GBB)..........208mm
HK 416A5 (GBB)...275mm
M27 (GBB)...........370mm
417 (GBB).................320mm
417 Recon (GBB).......380mm
417 Premium (GBB)...510mm/554mm
MP5 A2/A3/A4/A5 (GBB)...208mm
MP5 NAVY (GBB)................208mm
MP5K (GBB)........................115mm
MP5K PDW (GBB)...............115mm
MP5 SD3 (GBB)...................330mm
MP7 A1/NAVY (GBB).....190mm

【Pistol】
M1911..........112mm
M9................108mm
G17/18...........97mm
G19/23...........86mm
G34/35.........112mm
Hi-CAPA 3.8"...80mm
Hi-CAPA 4.3"...97mm
Hi-CAPA 5.1"...112mm
Hi-CAPA 7"......170mm
M&P 9 L.....94mm
M&P 9 S.....78mm
XDM................100mm
KJ CZ-P09.......102mm
KJ CZ-P01.......110mm
KJ CZ75 SP01 SHADOW....106mm