Gunsmithing FNAR inertia block spring dimensions?

[newnoob]

Hello,
I am wondering if any FNAR owners could take off their handguard and give me the length and diameter of the 2 inertia block springs, on this rifle they are missing. I called FN and browning and neither of them are able to give me dimensions or even a replacement spring (discontinued). Browning did send me some springs but they were too short, is there supposed to be a detent on them?
Thanks

 

[dhoover1027]

Try :
Midwest gun works.
Good source for parts.
And FN service