The Midwest Industries AR Muzzle Brake - 1/2-28 Two Chamber Brake will work with a Ruger 22LR rifle with muzzle threaded for 1/2x28.
The MI logo can be oriented at the 12 or 6 o'clock position and still retain full functionality. You can always use additional shims in order to time the muzzle device to your liking.
The Midwest Industries AR Muzzle Brake - 1/2-28 Two Chamber Brake is 2.3" in length. However, the manufacturer does not state the outside diameter. I recommend contacting Midwest Industries for that information.
It comes with a crush washer to use for aligning the device with the "MI" logo straight up.
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Unfortunately the manufacturer dose not supply this information i would suggest reaching out to them directly.
Midwest Industries does not currently make any blast deflectors for this muzzle brake.
From a review on their webpage, the dust signature is not bad.
Yes this will fit on an M&P15. There are legal ways to attach a muzzle break in California but you will have to research that yourself.
This will NOT fit 9mm, the bore is too small, so the bullet would not clear the muzzle device. This is only for use on .223/5.56 or .22lr barrels.