• Last Post 16 April 2019
joeb33050 posted this 14 April 2019



A .050” hole in the barrel reduces MV about 4% at the test conditions. There is a surprisingly energetic blast of gas coming out of the hole.


The .050” was a WAG. A larger hole in the barrel would make for a larger MV reduction.


A .050” hole has an area of ~ .002 in^2, so .002 in^2 ~ 4% MV reduction,


an .062” hole ~ .003 in^2, ~ 6% MV reduction,


an .093” hole ~ .007 in^2, ~ 14% MV reduction.


The point is, that drilling a hole in the barrel and then varying the effective hole size with a valve or a through-hole plug allows us to vary MV over a range.


A .093” hole drilled through the barrel, a large tapped hole centered in the same hole, and a screw with a through hole .050” dia would ~ 4% MV reduction.


A through hole of .062” dia ~ 6% MV reduction,


A through hole of .093” dia ~ 14% reduction.


Or an adjustable valve would allow a range of adjustment.


We are working with a Ruger 10-22 barrel and making a valve.  The 10-22 barrel is easily switched, 22rf is easy, cheap and many flavors are available.


And, we’re still looking to see if a valve will tame the high MV fliers.   


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mashburn posted this 16 April 2019

This is very interesting and am anxious to see how all of this comes out and what proof it produces.


David a. Cogburn

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