M4 Variant Bore-up cylinder kit

Technology: CNC.
Materail: Aluminum/Stainless steel/ Engineering plastics
For: M4 series airsoft AEG.
Application:
1. it is used Extensively, It avoids non-universal caused by different brands size tolerance, suitable for 90% brands.
2. BBs reloaded very smooth, Replaces stock cylinder sets for higher rate of fire.
3.Bore up size, higher power output and performance than normal set up