Dnk: lemme splain!! I got a slew of Danny Millers arrows. They are: 20" LII's, 4" vanes. brass inserts, for a total weight og 431 gr. They have a 20% FOC. [w/ 100 gr. points] Ya'll got me curious about this extra FOC I got. D. Miller said "they can go higher and you'll be ok" Meaning I'm sure 125 gr b-head. Sooooo I tuned my arrows to 15% FOC by screwqing 8-32 threaded rod into nocks. [1"=25 gr.] for FOC of 15%. I shot these puppies at 30 yds. No difference from 20% FOC. Soooo I shot the pictured group at 50 yds bench rest w/ the 20% FOC [no additions to the nock] I wasn't tryin to impress nobody, but wanted to show that 20% FOC ain"t bad, and the Slick Tricks went where the adverising claims. To tell the truth, I didn't know what the heck would happen when I shot this.