05-17-2017, 04:43 PM
i've got one 16" that is a m4 profile i got from JT/double star last year on sale it is one in 9" twist and it is a real 'hog-buster". i also have a couple pinned 14"s. the grendel seems like it don't care much either way.
i don't think the m4s port location is a problem on it cause the 6.5 is another pressure map compared to the 5.56 rounds we were busting.
i don't think the m4s port location is a problem on it cause the 6.5 is another pressure map compared to the 5.56 rounds we were busting.