Silverback SRS Teflon Spring Guide (Pull Bolt)
CNC stainless steel construction
Teflon tube covered
Japanese thrust bearing base
Essential Parts to built a durable and powerful upgrade
Ball Bearing reduce friction of the spring, make the bolt action running smoother on each shoot
Spring guide for SRS pull bolt

As always, upgrading AEG require necessary skill & technique to dissemble the gearbox, consult expertise if needed