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Thread: 30-degree taper for pistol barrel and piston?

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    30-degree taper for pistol barrel and piston?

    Has anyone ever heard of or experimented with machining a 30-degree taper on the shoulder of a pistol barrel and piston? Q and Sig do similar on some of their rifle barrels, and itís said to prevent the suppressor from backing off. It would be great if it kept a pistol suppressor from backing off all the time. It more or less turns the bare muzzle into a taper mount (at least thatís how I conceptualize it).

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    Griffin has done just this.



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    Clint, Griffin’s tech is what made me think of it, but all else being equal, I’d rather it be a direct thread application. I can’t think of any reason it wouldn’t work other than that the shoulder might not be big enough on the barrel itself.

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    Ummm, doesn't a thread on adapter defeat the purpose of any mount?
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    Quote Originally Posted by SteyrAUG View Post
    Ummm, doesn't a thread on adapter defeat the purpose of any mount?
    Thatís a valid point but the adapter is threaded to the barrel with a 3/4Ē socket and torqued to about 20 ft lbs. When mounting the suppressor, its a quick 1/8 turn or so and its locked on. The can does not loosen while shooting and can be easily removed. Cans loosening while firing is easily the number one cause of front cap/baffle strikes.

    You only need one piston for as many guns as you want, you just get the correct adapter for your thread pitch. Itís easy enough to remove the adapter with a socket for cleaning the gun, but isnít necessary as its no problem to clean with the barrel and slide together.

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    Quote Originally Posted by JimmyB62 View Post
    That’s a valid point but the adapter is threaded to the barrel with a 3/4” socket and torqued to about 20 ft lbs. When mounting the suppressor, its a quick 1/8 turn or so and its locked on. The can does not loosen while shooting and can be easily removed. Cans loosening while firing is easily the number one cause of front cap/baffle strikes.

    You only need one piston for as many guns as you want, you just get the correct adapter for your thread pitch. It’s easy enough to remove the adapter with a socket for cleaning the gun, but isn’t necessary as its no problem to clean with the barrel and slide together.
    With the can locked on, is there any danger of the weight of the can contributing to the unthreading of the adapter?

    I only ask because I've seen this happen with thread on 3 lug mounts where the adapter itself walked off the threads despite the suppressor being solidly attached to the mount itself.

    I know M-10 cans were notorious for walking off and after every burst it was prudent to give the can a a twist. Definitely helped you remember to wear some decent shooting gloves.
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    Quote Originally Posted by SteyrAUG View Post
    With the can locked on, is there any danger of the weight of the can contributing to the unthreading of the adapter?

    I only ask because I've seen this happen with thread on 3 lug mounts where the adapter itself walked off the threads despite the suppressor being solidly attached to the mount itself.

    I know M-10 cans were notorious for walking off and after every burst it was prudent to give the can a a twist. Definitely helped you remember to wear some decent shooting gloves.
    20 ft lbs is a fair amount of torque so I’d be surprised if it loosened under any circumstances on a semi auto pistol. Ive used it a lot for about a year now on various guns without issue and with great results but I guess anything is possible. Griffin says the system is not designed for fixed barrels (other than the rimfire setup) with or without a spacer (I don’t remember why) so I don’t think its suitable for a machine pistol. I understand what you’re talking about though and what limited experience I’ve had with full auto has taught me that they’re different animals and weird stuff can happen.

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    How tight does the Griffin piston have to be tightened onto the Camlok adaptor? I get the impression that with the taper, it doesn't have to be excessively tight to stay put.

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    Quote Originally Posted by Wyoming View Post
    Has anyone ever heard of or experimented with machining a 30-degree taper on the shoulder of a pistol barrel and piston? Q and Sig do similar on some of their rifle barrels, and it’s said to prevent the suppressor from backing off. It would be great if it kept a pistol suppressor from backing off all the time. It more or less turns the bare muzzle into a taper mount (at least that’s how I conceptualize it).
    Tapered barrel shoulders for silencers have been in use since 1909. The problem is handgun barrels that lack sufficient diameter so it's not going to be universal and it'd protrude even more from the slide. What you're talking about has been done but not yet made it to market as you'd need the backing from at least one very major handgun manufacturer with a compatible barrel profile. That backing is what made the SIG taper barrel shoulder successful. The SIG taper barrel shoulder should be in far, far more wide spread use than it is currently.
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    Thanks for weighing in Paco. That response pretty well puts to rest all of my curiosity on the topic.

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