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Tuning  Umarex M1A1 Thompson Repair

B
ninersix said:
Thank born2fly.
I am going on the 6th year (guessing... could be longer) with my M1A1 and at least 11K BBs thru it probably more judging by the large full box empty co2 cartridge's. With wood furniture... as I wrote before; "it is my favorite BB gun. I am thinking about getting another one and making some more "Kit videos" on how to improve and stabilize to gun indefinitely and making the kits to sell for those who want to keep them working.
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The more I think about this, the more I think the right solution might be to modify the cone valve.
I’m thinking that the bolt needs to move rearward more slowly but still slam forward with enough momentum to activate the poppet valve. That sounds a bit like the way a shock absorber works. Not sure if I’d want to try making such a thing for this application.
Alternatively, perhaps modify the cone valve so that it does not close completely, but permits some gas to leak out the barrel instead of redirecting it all to push the bolt back (a small spacer behind the delicate little cone valve spring might work). Less gas pushing the bolt would mean slower rearward travel. Just so long as it gets back far enough to reset the trigger. Forward travel would not change, as it would still be governed by the bolt spring.
I’m just brainstorming …
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Results  Sunnyvale N50 match results for 8/15/25

dmw6455
igolfat8 said:
Another great score posted Dana!

The scores are so close in the pro class:

TOP 5 SHOOTERS IN THE PRO CLASSIFICATION​

RANKNAMECLUBAGGX
1Harvey Waldron IIITacoma Rifle Revolver Club2249152
2Dennis KunkelOpen Grove2248140
3Dana WyseSunnyvale Rod and Gun Club2248137
4Mark ClemonsMeeker Sportsman Club2248133
5Mark HuberTacoma Rifle Revolver Club2247141
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I can’t seem to break the 748 score. Keep making a stupid mistake. Joe’s Thomas slug gun is now the one to beat.
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The Real Science of Airgun Suppressor Selection

C
DonnyFL said:
Hey there airheads!

The other day we sent out an email talking about all the years of experience we’ve had working with airgunners around the world—chasing down the best sound suppression possible in the airgun game. We got some great responses back, and thought, why not bring the conversation here to Airgun Nation and keep it going?

One of the big topics that came up was how air volume and internal design, whether it’s a monocore or traditional baffle stack, actually affect the shot report. Sure, there are computer models that can predict airflow and potential decibel reduction, but the reality is airguns behave very differently than firearms. They have their own quirks in how large volumes of air get expelled and how we tame that sound. Even though DonnyFL and airgun suppressors in general have been around for a while now, the science of airgun silence is still very much evolving.

When Donny first started this company, it was a lot of good old-fashioned trial and error. Just the other day, Yolanda was reminiscing about those early days, how she and Donny would stand out in the field doing A/B tests, swapping moderators back and forth, and listening closely to the differences in tone and volume. No meters. No fancy charts. Just honest, real-world feedback about what our ears told us worked best.

Over time, we’ve added sound meters and other R&D tools to the process, but we’ve learned something important: feedback from real shooters still matters more than any number on a screen. A meter might tell you it’s “quieter,” but your ears can reveal something completely different, especially downrange.

So how do you choose the right suppressor? It’s not as simple as picking the “quietest” one on the list. Caliber and power tuning matter, a hot-rodded .22 PCP can be just as loud, or louder, than a .22LR rimfire. Barrel system design plays a role too. Shorter barrels often have a sharper, louder report, while longer barrels can be sensitive to weight on the muzzle and may not play nicely with a heavy suppressor.

Then there’s how you actually use your rifle. In competition, suppression might not be the top priority, you might be more focused on how a suppressor can influence barrel harmonics. On the other hand, if you’re pesting in your backyard or working in a sound-sensitive area, maximum suppression becomes a must-have.

The quick and dirty rule is that more internal volume usually means better airgun suppression. But that’s oversimplifying it. Tone matters just as much, and in some cases, going with a really long moderator may hurt the balance or handling of your rifle.
We’re working on a comprehensive air rifle suppressor selection guide to help make those decisions easier. In the meantime, we want to hear from you. The best part about the DonnyFL community has always been the feedback we get from real shooters. We started out as a grassroots company right here in the online forums, and that community-first approach will always be part of who we are.

So, how do you judge airgun suppressor effectiveness? Is it tone, volume, group size, or a mix of everything? Got a favorite testing method you trust? Let’s make this thread a go-to resource for anyone looking to get the most out of their airgun sound suppression. Also, check out our full lineup of airgun moderators and air rifle suppressors!

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Airgun vs chalk @50 yards

K
Neu said:
Just goofing around with my Beeman under lever shooting some chalk @50.... Harder then you think.
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You're giving me an idea. What about using a steel tube just large enough for the chalk to slide in. Then weld it up so that the steel tube sits upright and allows about a half inch of the chalk to be exposed. You shoot the exposed chalk and get a nice puff of dust. Then the chalk slides down the tube and the next half inch is exposed for the next shot. I'm going to have to play with this concept. Thanks for the idea.
Kenny
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Walther LG400 Field Target questions

K
Brianburgess11 said:
Did you ever get that lg400? I ordered one but it showed up with a broken stock and butt plate so I’m waiting for them to ship me another one so I haven’t got to try it out yet, super anxious waiting for the other one to come. Just want to know how it went.
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Yes I did. I got the ten meter target version rather than the FT version though. I've had it since about March and I don't think I've stopped smiling. It is a terrific rifle. I shoot it just as much at silhouettes with a scope as I do at ten meters with the aperture sights. Both techniques are really fun. Even at the low power level it will smack those rams at 45 yards and knock them right over. A strong wind will make things very interesting though. :)
I'm sorry to hear that yours arrived broken. That must have been really disappointing when you opened that box. Did you order the FT version or the Ten Meter version?
Kenny
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Taipan  Taipan Slash

MACTEN
ram2jeep said:
I have typically purchased all FX rifles besides my Texan and Edgun L. I was rebuilding another regulator for my MK 2 and then working on the valve on my Panthera when I read about the Slash.
I called Tony at Talon Tunes and he convinced me to try the Taipan and that I would love it. I received it yesterday in .22 and initial thoughts are outstanding. You do not need a moderator on this in my configuration: can’t speak on other caliber’s. Build quality is such that when you pick up the rifle you realize this is top tier.
I haven’t run the bottle down to see shot count as of yet. Magazine is wonderful. Easy to load and shoot. With both slugs and pellets neither had problems finding their mark. I shoot 50 to 90 yards in my back yard, mostly woods.
Semiautomatic works wonderfully and I love not having to move my hand to load another pellet. More to come on this I am sure.
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Which version? barrel length tactical, standard etc. Good to see you're enjoying it so far. You're right about build quality... not too many are close out there in that regard.
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N/A  New pcp air rifle.

R
RMCIV said:
I will be shooting target and hunting..from mice to white tail deer and hog and it needs to do all I can spend 5k but not 20k I'm thinking a 30 cal. I could be wrong but think fpe for deer in my state is 250.
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So you you want a gun that is good for mice (4 FPE) to deer/hog (250 FPE).
There is no single gun that is capable of that... You need to consider two guns. Get a .22 cal that can be easily adjusted and a .357 and up in caliber if you are wanting into the 250+ range in FPE.
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Taipan  Taipan Slash

ram2jeep
I have typically purchased all FX rifles besides my Texan and Edgun L. I was rebuilding another regulator for my MK 2 and then working on the valve on my Panthera when I read about the Slash.
I called Tony at Talon Tunes and he convinced me to try the Taipan and that I would love it. I received it yesterday in .22 and initial thoughts are outstanding. You do not need a moderator on this in my configuration: can’t speak on other caliber’s. Build quality is such that when you pick up the rifle you realize this is top tier.
I haven’t run the bottle down to see shot count as of yet. Magazine is wonderful. Easy to load and shoot. With both slugs and pellets neither had problems finding their mark. I shoot 50 to 90 yards in my back yard, mostly woods.
Semiautomatic works wonderfully and I love not having to move my hand to load another pellet. More to come on this I am sure.
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RTI  The Mora does it again.

JoePolanco
Today at the a Southern Ohio Negional N50 match held at the Fairfield Sportsman's Association range, the RTI Mora put up some impressive numbers, easily winning the day.

A bit of badly needed redemption for me provided by the most accurate, consistent and dependable gun I've owned to date.

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Rochester Brooks results August 16

Poopshoot55
Set up the course yesterday with Doug Rogers, was calling for 89 today with light breeze. Got to the club at 8 to set up the practice range, people started rolling in and helped set up, which was greatly appreciated. Had Glenn and Nathan Thomas show up which was a nice surprise. Was about 70 degrees at the start at 9:30 and 85 at 12:15pm when we finished, winds were moderate at 5mph with slight gusts to 10, sometimes switching to our backs. We had one new shooter David who used my seat and borrowed some sticks, hopefully he will be back. High score of the day was Greg Shirhall with a 48 in Hunter Piston. Had 3 cold lines that were resolved quickly. For people who have shot with and know Doug Rogers, he went into the hospital today with health issues, please keep him in your thoughts. Results are as follows.
Hunter PCP
John Solpietro 46 MROD/Challenger Athlon Aries 10.5 Benjamin
Daryl Van Why 42 Benjamin Marauder Hawke Vantage 4-12x50, Benjamin 10.5
Nathan Thomas 41, Crosman Challenger, Athlon 6-24x50, AA 10.3
Rich Sarama 40, FX Crown, Element Helix, FX 10.3
Glenn Thomas 39, Benjamin Marauder, Hawke, 10.3
David 12, Avenger X .22, CV Life 6-24, JSB 18.1
Hunter Piston
Greg Shirhall 48, Walther LGU, Bushnell 6-24, JSB 8.4
Paul Manktelow 38, Walther LGU, Hawke, H&N Sniper 8.5
Eric Brewer 37, Air Arms TX200, Hawke, JSB 8.4
Brian Sarama 31, HW97, Element Helix, H&N 9.5
Open PCP
Rick Vaeth 47, Steyr Challenge, Sightron S6, JSB 13.4
Shawn Pragle 27, MROD, Vector, Benjamin 10.5
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Lets see those pistols turned carbine!!!

T
Long_Gun_Dallas said:
Added one to the fold.

Got as a pistol from Air n Gas Man (with airtube extension). Got real lucky finding an old/obscure Steve Corcoran stock. And a good friend turned down a HW30 barrel for me.View attachment 586659
View attachment 586658
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Nice!
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