Features Full metal Ruger MK4 slider and barrel assembly with high strength polymer G-series style lower frame

Metal outer barrel included

Easy to fill design

rotary hop-up

Monk Customs ESG for PolarStar MR Regulator Airsoft FN Scar Features Full metal Ruger MK4Monk Customs presents: ESG! The best Ergonomic Sports Grip out there, now available for Polarstar Micro Reg GEN2 Air Rig or Wolverine Storm OnTank regulators. Together with the champions of Second2None, Monk Customs have developed the most innovative, ergonomic and feature rich sports grip on the market today. Check out the main features: Available for Polarstar Micro Reg Gen 2 or Wolverine Storm OnTank regulators Can be ordered with or without