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.223 1:7 4 Groove Rifling

.223 1:7 4 Groove Rifling

grabcad

4 land 1:7 twist rate profile for any AR-15 or Rem 700 barrel chambered in 5.56X45mm or .223 Rem. Lands are .005" thick so your bore needs to be .224". This model will give you .224" grooves and .219" lands. Insert, split body at breech & muzzle and join to the barrel ID.thegunpsy.com

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