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20” upper on M4 carbine lowers - what buffer weight

I'm thinking this
Let me know

bkingsfirearms.com

BKF AR15 Sprinco Enhanced Power Carbine Spring (Blue) W/ BKF H2 Buffer (4.7oz)

WHAT MAKES OUR SPRINGS UNIQUE? All of our springs are constructed from Certified Chrome Silicon wirestock to ISO 9001:2008 quality standards to withstand extreme heat and highly cyclic rate. The certification rating ensures a consistency in the parent material of…
bkingsfirearms.com bkingsfirearms.com

Another thing I noticed
Castle nut is staked on this lower
 

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