If you had only the fast-pitch threads, your suppressor would vibrate loose once per magazine. A fast-pitch thread lacks the torque to stay tight, especially since it is wrenched on by hand and not with a tool. The ratchet is there to lock the suppressor in place. Also note the ratchet teeth on the mount itself. The Acme thread on this AAC mount has a grand total of one and a quarter turns to lock. Also, the threads on the muzzle device will often not be the common “V” threads you are familiar with, but have a profile known as Acme threads, which are flat-topped pyramids, not a pointy V.
A fast-pitch thread will be so coarse that it takes maybe two full rotations to tighten the suppressor, maybe one-and-a-half. If the threaded portion, the shank, is half an inch long, then it will take fourteen complete rotations to get it all the way tight.
Let’s take the common 1⁄2-28 thread for a 5.56 mount. “Fast-pitch” in this context does not describe a softball league, but the number of turns it takes to tighten a suppressor, or any threaded fastener. No wrench needed.Ī few details need explaining. You can install the suppressor by hand in a few seconds and, assuming it isn’t too hot to handle, swap it from one rifle to another as quickly. The muzzle device has a cylindrical or coned bearing surface, and fast-pitch threads and a ratchet or locking system. So, the makers came up with a mount called a “muzzle device”: one that threads onto the muzzle and stays there for the service life of the barrel. If you have a suppressor and two or three or more rifles you want to use it on, the wrench-and-direct-thread method gets old fast. But, once a suppressor is torqued in place, you need a wrench to remove it, and you need that wrench to install it on the next firearm. Direct thread is a secure, rigid and easy method by which to attach a suppressor. Quick-attach is a development that comes to us for a particular reason – cost. The mounting methods to attach a suppressor to a firearm fall into a few categories: direct thread, quick-attach, booster, integral, and exotic and rare. You need something more permanent, rigid, aligned and reliable. You are not going to attach your expensive new suppressor to the firearm of your choice with hose clamps and duct tape.
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