I have an Ace Hardware down the road that has a large selection of springs. You gave the dimensions of the spring I need, but is there anything else I need to know when selecting a spring? Also, while looking at airsoft gun upgrade videos on YouTube , some guys just stretched there springs. I guess that this would only be a temporary fix? Also, where the nylon nuts you used 1/2 dia.? Thank you for the help. As soon as I get my Pershing, Im going to teardown my Tigers turret. Im moding the gun and adding a light to the ammo compartment, so my glow BB's glow. I've already added a LED machine gun to the 4volt section,so I dont know if I should add an ammo light also. It might be too much draw. What do you guys think?