Modified M16 Muzzle Device

grabcad

This upload contains two items, both are modified M16 muzzle devices.The design intent was to produce a simple muzzle device that can be used by U.S. persons that wish to use a 14.5" barrel without permits, this is achieved through providing a muzzle device that can be pinned and/or welded to the barrel to produce a 16"+ barrel length.Both items will result in exactly 16" using a 14.5" barrel without any shims or washers, so by using the lock washer I have provided in another upload, the total length will be 16.104"; or better just use shims, which I have accounted for when I increased the minimum full thread length from 0.56" to 0.63"; the increase did not require any profile shift at all, just over specified the original so there is a reduced unthreaded face. If you like these as a blank, delete the vent features and model your own, it won't change anything else so it's easy.Method of fixing in place is up to the end-user, I was going to make it fit using an indexing key but I understand not everyone will want to use that method. Some people might not want this fixed in place at all.The muzzle device with the arbitrary radially located holes also has a glass breaker feature.I'd like to receive any comments on this as it is a basic design, however if you AR15 lovers out there have ideas I would be happy to try and come up with something.