Same details as the kit above.
About 20% less cocking effort then the regular Pro Mac Kit.
Velocity is only down on average of 5% or so.
Still above factory FWB specs. Very high 700's to 800 fps in a good gun ( 7.9 gr)
Great for sub 5000 serial number guns as they tend to be harsh if sprung too hard.
But designed for any FWB sporter.
Spare springs to kit owners are available.
Easy to install