●for FN SPR A5M / DT M40 / Marui VFR-10 
●Players can fix the inner barrel by placing the set in the middle to prevent the influence of vibration on internal ballistic
●Or players can use it as silencer spacer to suppress the muzzle blast.
●Mutual thread
Suitable for below types: 
●Maple Leaf VSR10 Bull Barrel full series
●DT-M40 Sniper
●Tokyo Marui G-Spec 
●PDI VSR10 Light Outer Barrel (Made in Japan)

INFORMATION of using the product as silencer spacer :
Remove all of internal o-rings before connecting inner barrel including the one at VSR outer barrel cap to prevent collision between the BB bullets

Reference: 
●300mm inner barrel + 430mm outer barrel - 7 sets
●300mm inner barrel + 470mm outer barrel - 9 sets
●430mm inner barrel + 470mm outer barrel - 2 sets
●430mm inner barrel + 510mm outer barrel - 4 sets 
●470mm inner barrel + 510mm outer barrel - 2 sets