Matador shroud vent mod=quieter
Ive been shooting my new R3(new reg version) 25 cal Long and cant help but notice the distinct blast of air out of the vent holes.
My R3 22 Long air release is barely felt or heard,but this 25 is blowing hard puff of air and the sound is definitely noticeable(mostly what I hear on shot).
The vent holes are same size on both shrouds as shrouds appear to be same( standard interchangeable part)
I know the 25 is pushing considerably more air and am wondering if slightly larger holes or more would be more efficient to venting additional volume(allowing pellet to leave baffle in a vacuum,increasing accuracy ) as well as larger/more holes not increasing velocity of escaping air(less noise).
After all compensators on PBs get more or bigger holes as caliber/power goes up.
Thoughts anyone?
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I heard the predators do good in the .25 but I have a .22 and I just ordered some…I want to see how they perform.
I actually don’t worry about the .25 std Edgun noise because the Predators I always shoot sound like little firecrackers when they hit a pest making the gun noise incidental. 😮 My modded Condor is the loudest with about 110 FPE with 62 grain Surefires. Even the 10″ moderator doesn’t completely quiet it.
Any change in accuracy?
I contemplated just going 3 but stopped myself. Think I’m at point of diminishing returns.
Then again the volume and speed of air still coming out of those holes is impressive. Hmmmm :-).
I hear you SECoda. But Ive never had a problem taking things apart and modding them after some calculations and evaluations which lead to better performance.
I’m honestly more impressed with 22. Wife just got home a bit ago so I had her shoot them at 20yd target
while I stood 10 yds to side equal distance from her and target. 22 Pellet hitting rubber mulch target stop is significantly louder than muzzle . The 25 was about equal muzzle to impact.
I am weak. 😥 I just can’t get myself to drill on the metal of my 2k air gun. 😯
Looks like you were heading for a 3rd row of holes.
I’ve been playing some more.
Added another row of 3/32″ holes to 25. It’s as quiet as its going to get now I believe. It just pushing a lot of air compared to 22. Hammer is definitely primary noise while shooting. I’d guess 75-25 over muzzle.
Opened up holes on 22 shroud to 5/64″ no scotchbrite inside. I can only hear hammer while shooting now aside from pellet hitting target.
I thought the Clintons moved? 😆
Regards,
H 😯 😯 t
A lot bigger.
Did more side by side sound comparison of 22 against modded 25.
Shooting both(face on breech)= 22 hammer strike significantly louder than muzzle. I’d guess 9-1 noise ratio.
25 stock-muzzle was noticeably louder than hammer. 7-3 ratio
With 3/32″ holes and pad inside shroud the hammer is now louder. I would honestly say a 6-4 ratio. Nice improvement.
The 25 is still louder than 22 overall of course. It’s pushing more air but definitly toned down.
I like silent too (dont we all) so I really hope you show off your mod (Pictures or it didn’t happen!) as this seems easy enough to do… even for a clumsy guy like myself.
Q
Update on the R3 25. Been experimenting and finalized tonight. I opened up the rear vent holes initially to 1/16″ each. Less of a high pitch pffffffffffsssst and more of pffffffffffffft. A Noticeable improvement. Decided to open up holes to 5/64″. Even better. Nice big muted puff of air. Shot it for awhile and figured, bigger?? Why not :-). Tonight opened up holes to 3/32″ (appx 2.4mm) and what I’m guessing to be an equal match volume wise to the front stripper holes that feed rear chamber. Lots of air moving now, just a big puff. Now to muffle. Took a 1/4″ thick grey scotchbrite pad which we get from body shops for paint prep And cut to 2″ wide to wrap around barrel by 3.5″ long. Pushed it down to the middle of rear shroud. The hammer strike is now louder than muzzle even while standing a few feet away. Very very happy.
I’m thinking about enlarging 22 vent holes to 1/16″ with scotch pad now.
Ive got to make a rubber mulch target box for quiet backyard practice to go along with this quiet gun.
Excellent info From you both. I think first place to start will be rear shroud vent holes, then possibly the forward stripper holes. Those are considerably larger as they feed the rearward tube. But I’m with you on theory that its first stage of air dump.I look at it like a cars engine. First and easiest way to get it to breathe better is open up restrictive exhaust. I can easily drill additional holes and align towards air tube so not visible. I light felt wrap around holes is a good idea. Got some numbers to crunch first to see how many I should start with unless Ed chimes in and says 25 is fine and the 22 is actually over vented
🙂
If you decide to modify the vent holes, something which I have routinely done with shrouds, consider additional holes, in a straight line, at the bottom of the shroud, where the exhausting air will not affect the shooter, or the people beside him. It won’t take many, perhaps four to six small holes, perhaps a quarter inch apart.
I have run a line of holes up the bottom of the shroud, so the air goes into the forearm, which muffles the extra sound. Also, they do not show. Further, I can then add some felt material between the holes and the forearm to muffle the extra sound. Start small, there is a diminishing return on these vent holes. Too large, or too many, is not the answer. Better additional small holes than larger existing holes. Just be certain to stay behind the baffles.
By increasing holes, or hole diameter, you are giving the air pressure at the muzzle another place to exist the gun. Because the manufacturer must consider looks, performance, and sound, the OEM shroud results may please most people, but not all people.
Personally, I need quiet, thanks to my Bitch, Communist, Democrat, neighbors. That son of a bitch would stab and eat his own mother…..alas, I digress. as I was saying, I need quiet, and a lot of it. modify the vent hole number/diameter has helped, to a point. It is not the end all answer, but it is one of the answers available to you.
Remember, adding vents artificially increases the interior volume available to the expanding air, that helps, but after that, you must go to the second technique, muffling, to quiet the additional escaping air. That’s where a bit of felt material can help out.
The hard work, baffling has already been done, so you shouldn’t need much extra modification to get where you want. Better to under do it than over do it. When the sound gets to an acceptable point, stop there and go no further.
Regards,
H 😯 😯 t
Was thinking about this more…
Don’t think the od of the barrel is any larger than the 22.
The overall air restrictive holes are the ones that go from the first stage of the mod to the rear most stage of the shroud. The first stage has the angled air stripers, there are a bunch of small holes around the crown of the barrel that feed the air back into the section that carries the small holes that sit under the scope mount.
You could expand the holes in the rear shroud but it may not change the sound level that much because the holes at the crown will still be the same. Meaning it will probably get a little louder but at some point it’s not going to matter too much unless you make the other holes (front to rear transfer holes) bigger.
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Jdr724, nope, still one ragged little hole at 20. There already both proven at longer distances. I the shooter induce majority of the group size. I shoot off the bipod and not one of those fancy micro rests. :-). Hunter first, paper punch for tuning.
My standard of performance measure is a golf ball size group in mild wind at 100. If I can shoot that then the gun is doing its job in my hands with my bad eye :-). Any tighter is a great day.
SECoda. I hear ya. Quiet is a bonus for shooting at house as it keeps neighbors less aware while I practice trigger time. At the farm or out hunting I’m not overly concerned with loudness.
The biggest thing I’m looking for is efficiency of bleeding off air from front stripper out rear chamber.
The front baffle assembly has 14 -5/64″ holes to vent air to rear shroud. Doesn’t make sense to me to have any smaller holes for bleed off. Air in air out.