EPeS VSR Sniper Upgrade Cylinder Set

EPeS Sniper Air System Upgrade Set for VSR

Looking for a way to get the maximum accuracy, range, and shot silence out of your bolt-action sniper? Want to buy a ready-to-use, hand-tuned set tailored to your rifle? Need an easy upgrade that only requires a drop-in cylinder replacement? The EPeS Sniper Air System Upgrade Set delivers a complete assembly of carefully designed and pre-installed components that greatly improve rifle performance. It includes a tight stainless cylinder with sealed head and Sorbopad, CNC spring guide with bearing and POM sleeve, a high-power M150 spring, and a CNC Variable Mass Piston (VMP) with stainless and dural weights. The adjustable piston weight lets you achieve quiet shots, higher energy, and stable groupings with heavier BBs (Joule creep effect). The spring guide with bearing and anti-vibration sleeve reduces vibration and sound, while the Sorbopad protects internal parts and extends lifespan. Each set is individually tested at EPeS for sealing, smoothness, and sound, so you receive a fully assembled ready-to-use cylinder. Note: adjusting piston weights is not plug-and-play – proper knowledge of bolt-action mechanics is required.

Recommended Piston Weight Tuning Process

1. Choose your target BB weight (e.g., 0.43 g, 0.49 g).
2. Test weight combinations from lightest to heaviest and record total piston mass.
3. Fire 3–5 shots per setup, record average Joules, and monitor shot noise.
4. Select the configuration that offers the highest consistency with acceptable noise.
5. Verify results in the field with hop-up adjusted.

Key Features

• Complete CNC set:
  Stainless cylinder, CNC spring guide with bearing, VMP piston, CNC cylinder head with Sorbopad, guiding components.
  
  
• M150 spring:
  Optimized stiffness for higher performance and consistency.
  
  
• Variable Mass Piston (VMP):
  Stainless + dural weights for power and noise tuning.
  
  
• Spring guide with bearing and POM sleeve:
  Minimizes vibration and noise.
  
  
• Sorbopad on cylinder head:
  Cushions piston impact, lowers noise, protects parts.
  
  
• Tested by EPeS:
  Checked for sealing, piston fit, smooth operation, noise, and output before shipping.

Technical Specifications & Compatibility

• Compatibility: VSR (Tokyo Marui VSR-10) and replicas such as Well MB-02/MB-03, JG BAR-10, CYMA CM.701, and others
• Cylinder: CNC stainless steel
• Piston: CNC VMP with stainless inserts + dural weights (blue finish)
• Spring guide: CNC with bearing and POM anti-vibration sleeve
• Spring: M150 (AirsoftPro or equivalent)
• Recommended BB weight: 0.43–0.48 g depending on piston load
• Performance (with max piston load in EPeS Custom Sniper): 3.8 J (0.48 g)

Package Includes

• CNC stainless cylinder
• CNC cylinder head with Sorbopad
• CNC VMP piston
• 4× stainless piston weights (pre-installed)
• 4× dural piston weights (blue)
• CNC spring guide with bearing and POM sleeve
• M150 spring
• Assembly accessories and basic installation guide

Warning

• This set requires advanced technical knowledge and experience with bolt-action disassembly.
• Performance and sound depend heavily on overall tuning (barrel, hop-up, sealing, fitting).
• For minimal noise, use a high-quality suppressor and properly fitted piston rings.
• Improper installation may damage rifle and parts; professional assembly is recommended.
• All sets are hand-tested at EPeS before shipping.
• Tested with: CNC Action Army hop-up chamber, MadBull Sniper hop-up rubber, Lambda 6.05×430 mm inner barrel, AirsoftPro Gen5 trigger unit.