Doing my first build. General purpose...home defense/range gun, maybe varmint. I am worried about twist rate. This barrel > Del-Ton, Inc. AR-15 16" Mid Length Light Weight Barrel is everything that I want, except 1 in 7. I gather from my reading that a 1 in 7 is what I want. Will I be happy with a 1 in 9? Suggestions and vast wisdom will me much appreciated.