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Make sure your gas block & tube are tight. You may be leaking a little bit of gas out of there that creates a louder impulse sound.
Note that the shorter barrel is going to be louder than your 18" barrel, and the action noise of the AR will contribute somewhat to what you are hearing. My .300 WTF is nowhere near as quiet as my suppressor is on a .308 bolt action with a long barrel and subloads, but it can put a lot more rounds down range and is much lighter and easier to carry.
As others have stated, powder will affect the sound and the faster the burn rate, the less your suppressor will have to minimize since the idea is to have the powder fully burned before the bullet reaches the suppressor. Alliant 2400 and N110 are what I use for my pet loads. I wasn't happy with the accuracy of AA1680.
If you can Chrony your loads, you will take a lot of the guesswork out of your rig if it is just on the transonic cusp.
How do you like the Fail Zero?
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Threaded Mode