Spare spring in box... M-1??
To the point:
The VFC SCAR-L I picked up came with a spare spring. The rifle's velocity is stated at 430+ fps on the manual. I can only assume that the fps applies to the stock spring in the rifle.
Can I assume that the spare spring is a downgrade spring? Guesstimates to what rating it may be - M100, M120...?
(I really wish I had access to a chrono... *sigh*)