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Posted: 9/23/2012 11:45:58 AM EDT
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I was talking with a friend about suppressors the other day and he is under the impression that a larger barrel diameter is more desirable for running a suppressor. In other words a .45 is easier to suppress than a 9mm would be. I had always heard the opposite, that a smaller diameter is easier to suppress. Which is correct? I read the FAQ thread and didn't see anything about diameter.
Also for those who run a larger than bore sized can (as in .30 cal suppressor on a 5.56 rifle) wouldn't it be more efficient to run a can that matches the bore diameter? I understand why people do this, but is it more effective to run a can that matches the bore diameter than having a "1 for all" can? Sorry if this has been covered before, I didn't see it mentioned specifically in the FAQ. |
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The general rule of thumb is that the smaller the bore diameter, the less gas can escape from a supressor. Basically, a .22 subsonic round is quieter than a subsonic 9mm round, which in turn is quieter than a .45 subsonic round. When you shoot these rounds through the cans they were made for, they tend to be a little quieter than when they are fired in overbore cans. Also, the larger the diameter of the round, the more likely you are to have a larger powder charge in the round being fired, hence the majority of the noise.
In a perfect world, a 5.56 can on a 5.56 gun is quieter than a 7.62 can on a 5.56 gun. However, most 7.62 cans have a larger volume and resonate at a lower frequency. Most times, you cant tell any real difference between the two combinations. If you use a small/micro 7.62 can on a 5.56 gun, it tends to be louder than a dedicated 5.56 can. The lack of volume in the can has alot to do with this, I assume. If you can deal with the extra size and weight, a 7.62 can is always a great choice to fit most of you 30 cal and sub caliber rifles. I still think its a moot point though, because very few people stop after buying one can. Youll end up with all of the common calibers anyway. 
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