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by Tommy, from CA, United States Asked on January 13, 2019
It would most likely be best to step down in length because what you want to try to avoid is the muzzle blast and gasses from the barrel being confined by the handguard as I have seen this cause a catastrophic failure because the muzzle blast blows out the end of the handguard. The only way to avoid this would be to get a muzzle device that extends past the handguard and does not have any porting that is under the end of the handguard.