Is M4A1-S crystal worth it??

I've posted a thread last night about what coupon guns I should get, I got a lot of replies saying Gold guns and M4A1-S crystal.
I do not really want gold guns because they are just waste of coupons to me, and noobs always steal Gold guns.
I have: M4A1-Custom, perm axe, DE-camo, AWM-camo perm. Do my need 2 copies of the same gun.
My question is, is M4A1-S crystal worth the coupons?
I know the ammo is 30/90, not a big problem unless I spray LOL
Is the accuracy pin point when crouching like M4A1-A silver?
Is the recoil lower than M4A1-Custom?
What's the fire rate? Compare it to a gun
What's the power? Give me numbers plz

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