I was kicking around this idea of ï¿½linear bafflesï¿½ for a 9mm mono-baffle for my 9mm AR-15 and wanted to see what you guys think.
1.5ï¿½ 303 stainless bar stock center bored to the proper diameter for 9mm (I was thinking .4104) then bore holes from the outside of the stock through to the bored centerline at 60deg to the center line of the bore at regular intervals along the longitudinal lined of the stock at 0, 45, 90, 135, 180, 225, 270 and 315 degrees. Then cut longitudinal flutes along the same lines to act as chambers.
Iï¿½m no machinist, so my description might not be the best, but I hope that you get the idea.
Latitudinal cross section + Longitudinal cross section:
Here is a Form2, 9mm mono stack before it was finished.
Its made using 304 ss with a 1.500"dia tube. OAL is about 7.500"
Bore is .404 dia., threaded 1/2"x28 and .625x24 end cap.
The end cap was threaded in this fashion so that an extension (another can) could be threaded on for further sound dampening when a compact package wasn't needed.
This stack was tested on a Swedish-K. Certainly hearing safe (dry) using 147gr. subsonic ammo, 115gr Wolf and some of the open bolt only 115gr. corrosive ammo designed for cold weather. The action of this weapon makes this gun difficult to suppress.
I took a Soumi barrel and threaded it 1/2x28 tpi just forward of the barrel shroud. minor fitting was required on the O.D. of the barrel so it would fit in the Swedish K trunion.
Also ran the can wet with approx. a tablespoon of water with great sound reduction. Sound reduction was good for about 28 of the 36 rounds in the magazine on full auto.
First round pop was all but eliminated when run wet. Dry it was pretty loud.
Tested it at night and flash was reduced dry and wet even the ejection port flash was minimal.
IMHO the can could/should have been made of Aircraft Grade Aluminum as it was really heavy. But with the corrosive ammo its easier to clean.
Also tried it on a 11.5" M-16...... and its far from being hearing safe or reducing muzzle flash. It did however reduce the sound signature.
Both weapons were obviously easier to control (see suppressor weight)
Not pictured is the groove for the O-ring (machined after pic) and I also reduced the oal (.625) end where it threads onto the barrel.
Put it on the 10/22 and worked pretty good as well.
Was a fun exercise.