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Donny FL QD Mount - do you go one size UP?

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Ultralight

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Apr 15, 2025
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With Donny FL, they recommend that one goes ONE SIZE up when using the QD mount.

For example, if you shoot .25, go .30.

Two questions:

1. Anyone here use the QD and use the proper-sized moderator rather than going one size up? For example,if you have .22, you use .22 with the QD rather than .25.

2. Generally, my understanding is that one wants the smallest aperture (hole size) possible for maximum moderation. Any sense of whether it is noticeable reduction in moderation going from a .25 to a .30?

Thanks.
 
Ultralight said:
With Donny FL, they recommend that one goes ONE SIZE up when using the QD mount.

For example, if you shoot .25, go .30.

Two questions:

1. Anyone here use the QD and use the proper-sized moderator rather than going one size up? For example,if you have .22, you use .22 with the QD rather than .25.

2. Generally, my understanding is that one wants the smallest aperture (hole size) possible for maximum moderation. Any sense of whether it is noticeable reduction in moderation going from a .25 to a .30?

Thanks.
Click to expand...
I use a qd on a 22 yokozuna on a 75 fpe 22. I haven't had any baffle strikes and I'd like to think I'd notice if I did at that energy. 1 up is safe and ads some diversity to the mod. I did notice on a home brew mod that it counterintuitively got quieter as I increased the bore diameter to .3125 for a 22 semi auto that has a tone of muzzle blast.

I know I'm an outlier in my obsessive alignment if moderators with bore up to and including arbor shims or strips of shim stock and re tapping threads to a lesser tolerance spec to allow the wobble needed to straighten them out. As vetmx says, sometimes will power, tools and time are as much a blessing as they are a curse.
 
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Lewis said:
I have migrated most of mine to .30 as that is the largest caliber I shoot. The difference in sound signature and air stripping seems to be far more affected by the volume of the can than by the diameter of the through hole.
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To this I must add another thing that shocked me in it's counter intuitive results. I had a larger shroud with an air stripper and a ronin on the same gun. A huge amount of expansion volume, and the yokozuna is as quiet or quieter with less volume and some pretty intense baffles. It blew my mind.
 
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6gun said:
To this I must add another thing that shocked me in it's counter intuitive results. I had a larger shroud with an air stripper and a ronin on the same gun. A huge amount of expansion volume, and the yokozuna is as quiet or quieter with less volume and some pretty intense baffles. It blew my mind.
Click to expand...
What do you mean by "pretty intense baffles?" Thanks
 
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6gun said:
I use a qd on a 22 yokozuna on a 75 fpe 22. I haven't had any baffle strikes and I'd like to think I'd notice if I did at that energy. 1 up is safe and ads some diversity to the mod. I did notice on a home brew mod that it counterintuitively got quieter as I increased the bore diameter to .3125 for a 22 semi auto that has a tone of muzzle blast.

I know I'm an outlier in my obsessive alignment if moderators with bore up to and including arbor shims or strips of shim stock and re tapping threads to a lesser tolerance spec to allow the wobble needed to straighten them out. As vetmx says, sometimes will power, tools and time are as much a blessing as they are a curse.
Click to expand...
Just goes to show that physics is complex. Never would have thought a larger aperture diameter would reduce perceived decibels.
 
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Ultralight said:
What do you mean by "pretty intense baffles?" Thanks
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It's not a glorified muffler(this is highly reductive) . It's got something like k baffles re imagined for compressed air. A lot of intense engineering and probably quite a few more machine operations. PLUS you can harmonic tune with it to a rough degree by removing baffle segments as i have done. 6 inch groups went to 1 hole by dropping one segment and its noise didn't increase noticeably.

I have a ronin, a donny fx, and some tko22s for commercial mods and made a bunch of my own having previously worked in aerospace machining when I was younger..... The yokozuna impressed me quite a lot for the quality, thought, execution and results because I'm a real stickler about noise.
 
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This is each end of a baffle segment and then a side view

1751497761057976208523269254992.jpg


1751497785303289871903494539947.jpg


17514978024168296076756535180691.jpg
 
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6gun said:
It's not a glorified muffler(this is highly reductive) . It's got something like k baffles re imagined for compressed air. A lot of intense engineering and probably quite a few more machine operations. PLUS you can harmonic tune with it to a rough degree by removing baffle segments as i have done. 6 inch groups went to 1 hole by dropping one segment and its noise didn't increase noticeably.

I have a ronin, a donny fx, and some tko22s for commercial mods and made a bunch of my own having previously worked in aerospace machining when I was younger..... The yokozuna impressed me quite a lot for the quality, thought, execution and results because I'm a real stickler about noise.
Click to expand...
I would say if you went from a 6" group to a 1" group just by removing one baffle that your can was just long enough with the one extra baffle that you were getting an internal strik near the end. Just my $0.02.
 
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ctshooter said:
I would say if you went from a 6" group to a 1" group just by removing one baffle that your can was just long enough with the one extra baffle that you were getting an internal strik near the end. Just my $0.02.
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I looked at it and didn't see any skid marks . It's a 700mm barrel and at 100 yards. My gun has always been picky about barrel harmonics with lighter slugs in all of it's various iterations WITH the tungsten hammer. And not 1 inch, 1 ragged hole. It was harmonics, including an increase in reg pressure by 3 bar.
 
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Ultralight said:
One reason for Yokozuna is the QD mount.
Click to expand...
Not trying to be being a smart A, but what's the draw to a QD over a thread mod.
If it's time how much are you really saving I just took off and replace a mod in 18 seconds.
Sorry for the question but I feel like I am missing something.
 
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TimeRabbit said:
Not trying to be being a smart A, but what's the draw to a QD over a thread mod.
If it's time how much are you really saving I just took off and replace a mod in 18 seconds.
Sorry for the question but I feel like I am missing something.
Click to expand...
I have no idea, bulky/heavy and obviously could cause clipping. Donny marketing like usual.
 
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TimeRabbit said:
Not trying to be being a smart A, but what's the draw to a QD over a thread mod.
If it's time how much are you really saving I just took off and replace a mod in 18 seconds.
Sorry for the question but I feel like I am missing something.
Click to expand...
No problem at all with the question. I too had the same opinion.

Then I tried the QD. It is not just time savings - as that is minimal in the larger scheme of things. It simply feels great with how smooth and quickly to works. It makes mounting the moderator a pleasure.

With screw in moderators, I sometimes have a bit of trouble catching the thread because I'm just a bit skewed while seated in a shooting position and the barrel pointed away from me. Then I have that removed piece of 'nut' that goes on the 1/2 20 UNF thread to put away and track. (I don't like to have bare screw threads on the gun when I put it away.) And if I misplace that 'nut' I have to search for it. And then screw in and screw out. Sometimes I do short stints for muscle memory a few times in a day when I take short breaks. The QD adapter stays on the gun so no nut, no exposed thread to damage, and it looks fine.

On top of that, the Yokozuna is modular so I can shorten or lengthen as I change power settings, and I can tune the harmonics a bit though this is not a real issue in my case usage. I've seen some use 2 short sections and then go full 4 sections when the power goes up. Flexibility. Some of the other moderator suggestions on this thread are not modular.

All in all, the QD is wonderful for me.
 
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