Wolverine Airsoft "BOLT M" HPA Conversion Kit for TM VSR-10 System Airsoft Sniper Rifles
(Model: Tokyo Marui VSR-10)

"Follow-up review
About 2 months after posting the review I had two issues that resulted in me being unable to use my jg bar10 for 7 months due to overall confusion surrounding bolt action rifles and how the bolt m operates. 2 months in I faced slam firing and a seemingly bad airseal in my jg bar10. I originally chalked up the issue to the bolt m as I assumed it operated as a standard hpa system with air from the tank directly pushing on the bb, however the bolt m system is more of a hybrid between the electric bolt and a standard piston operated spring powered rifle. It has a light bolt pull and adjustable psi however it most importantly requires a strong trigger sear if you use anything above 80 psi. That's the difference, the original bolt uses no sears and operates like a normal hpa while the bolt m uses sears and used the hpa to act as a spring that slams a piston forward. After putting in an angel custom steel sear to replace the jg pot metal sear, all my issues were resolved including the bad air seal which was actually the result of partial slam firing that severely reduced power output causing the bb to only roll out of the barrel. I also installed an action army hop up chamber, lambda 6.03 barrel, and maple leaf pink bucking. With a .28g bb, 80 psi, and 450 fps I was able to consistently hit 90 yard shots on paper and recently got one in game at 90 yards

"Very easy to install and works like a charm! Wolverines youtube tutorial was very straight forward and helped with expected install issues. 10/10