Piston choice for AAC Ti-Rant on my UMP?
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Thread: Piston choice for AAC Ti-Rant on my UMP?

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    Default Piston choice for AAC Ti-Rant on my UMP?

    I have the 16x1M threaded booster in my Ti-Rant for use on my USP tactical and have used it on my UMP with no problems, but a friend cautioned me that it may lead to problems with extended use. I called AAC and the customer service guy there said it wouldn't make a difference, but he didn't sound too sure when he said it.

    Can anyone with experience with this setup give me first hand knowledge on the subject?

    Thanks!
    The MULE

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    Your friend is referring to the Nielson device (AKA booster) on a fixed barrel. The UMP is a fixed barrel and the booster has a tendency to "beat" on the barrel. The solution is to remove the spring from the booster and put in a fixed barrel spacer.

    https://www.advanced-armament.com/Im...ies_p_721.html

    I have shot my UMP with and without the spacer and I see no damage to the barrel. With that said, I'd rather do it right than risk screwing up my barrel.

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    I have the same combo. You should be using the fixed barrel space instead of the spring.

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    Quote Originally Posted by skullbox View Post
    I have the same combo. You should be using the fixed barrel space instead of the spring.
    this right here is the correct answer. AAC sells the fixed barrel spacer which isn't too terribly expensive but will save you a ton of grief in the future.

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    So then let me ask, what would the consequences be if I had the fixed piston in place and was to be using it on my USP?
    Thanks!
    The MULE

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    Quote Originally Posted by G0VT_MULE View Post
    So then let me ask, what would the consequences be if I had the fixed piston in place and was to be using it on my USP?
    Thanks!
    The MULE
    Likely, it wouldn’t cycle. The recoil setup on tilting barrel pistols take into account the masses of the barrel and the slide. Adding a suppressor adds extra mass to the system that it wasn’t originally designed for. The spring action in the booster piston basically counteracts the extra mass by boosting the recoil action.

    BTW, to be clear, what we are talking about is a fixed barrel SPACER. It replaces the SPRING in the booster assembly. The same exact piston is used with the spring or the fixed barrel spacer.

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    Quote Originally Posted by dwillHK View Post
    Likely, it wouldn’t cycle. The recoil setup on tilting barrel pistols take into account the masses of the barrel and the slide. Adding a suppressor adds extra mass to the system that it wasn’t originally designed for. The spring action in the booster piston basically counteracts the extra mass by boosting the recoil action.

    BTW, to be clear, what we are talking about is a fixed barrel SPACER. It replaces the SPRING in the booster assembly. The same exact piston is used with the spring or the fixed barrel spacer.
    ---------------------------------

    Yes, as I would expect. But what about undue stress to the threads?

    The reason I ask is because I don't really wish to be switching out spring and spacer in the field. I can't imagine that operationally the "elite units" that might have this combo would bother.

    Thanks!
    The MULE

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    Quote Originally Posted by G0VT_MULE View Post
    ---------------------------------

    Yes, as I would expect. But what about undue stress to the threads?

    The reason I ask is because I don't really wish to be switching out spring and spacer in the field. I can't imagine that operationally the "elite units" that might have this combo would bother.

    Thanks!
    The MULE
    I doubt elite units are swapping out cans between pistols and carbines in the field in the middle of a mission. These days, most use 5.56 rifles, and the cans used on them typically are can’t be used on pistols simply because they aren’t the right size. Plus, the suppressors are usually attached to the rifle via a mount, which means that the suppressor has to be swapped from the rifle mount to the piston mount anyway.

    All I can say is that suppressor manufacturers do not recommend using a spring with a fixed barrel. Presumably they know what they are talking about. Will your suppressor or gun be irreversibly damaged if you shoot it a few times with or without a spring or fixed barrel spacer? Probably not. It’s your suppressor to do with what you want.
    mew likes this.

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