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Ok, I'll only mention this because I really like the subject.
First, don't shoot your gun in the city, even if your neighbors don't hear it and you have some shot placement issues, you could hit something important/dangerous like a gas or electrical line. It's just a bad call all around.
Back to the topic. You are not going to get anything that will be quiet and cycle, in fact just about anything fired out of a semi will be louder than a single shot or bolt action. Second, the impact of the bullet can be quite loud, at work we've been messing around with some suppressor designs (type 10 FFL) and found on our indoor range that it's very difficult to judge the effectiveness of a suppressor by ear indoors, so we have to use all kinds of fancy audio equipment, where you can actually see the click of the gun, the ignition of the powder, the bullet leaving the barrel, and the sonic crack (if it makes one) plus the bullet hitting the target. It's pretty interesting to look at.
We started out testing with an AR with a drop in .22LR kit, and yea, it sorta worked, but was still pretty loud over all. I recently threaded up the barrel of a .22 bolt gun, and using the same cans with either CCI standard velocity, or some of the remington subsonic most pellet guns are louder. One of these days we need to actually do a range day and see what they sound like outside, the db suppression is about 10-20db depending on ammo.
First, don't shoot your gun in the city, even if your neighbors don't hear it and you have some shot placement issues, you could hit something important/dangerous like a gas or electrical line. It's just a bad call all around.
Back to the topic. You are not going to get anything that will be quiet and cycle, in fact just about anything fired out of a semi will be louder than a single shot or bolt action. Second, the impact of the bullet can be quite loud, at work we've been messing around with some suppressor designs (type 10 FFL) and found on our indoor range that it's very difficult to judge the effectiveness of a suppressor by ear indoors, so we have to use all kinds of fancy audio equipment, where you can actually see the click of the gun, the ignition of the powder, the bullet leaving the barrel, and the sonic crack (if it makes one) plus the bullet hitting the target. It's pretty interesting to look at.
We started out testing with an AR with a drop in .22LR kit, and yea, it sorta worked, but was still pretty loud over all. I recently threaded up the barrel of a .22 bolt gun, and using the same cans with either CCI standard velocity, or some of the remington subsonic most pellet guns are louder. One of these days we need to actually do a range day and see what they sound like outside, the db suppression is about 10-20db depending on ammo.