View Full Version : Suppressor bore/channel diameter?
Royalflush
12-04-12, 22:54
Hey guys, new to M4C, but had a quick question.
May be a better question for silencertalk, but I figured someone here may know.
how much wider should the internal channel and bore of a suppressor be compared to the projectile?
ex. if you had a 5.56mm projectile, what would the diameter of the channel where the projectile travels in the suppressor. It was just on my mind after I looked at a friends suppressor.
There is no spec. It's different for every can out there. Please if you a planning a form1 can and asking this question, just stop now!
Royalflush
12-05-12, 10:02
oh no, not planning on that!
I was just curious becuase I noticed that 5.56, .22 and 9mm all had 1/2x28 thread pattern. Obviously I'd never fire a 9mm through a 5.56 can, but I was kind of curious about the dimensions.
Just "theorizing" a little about how they work- if a tighter "channel" would lead to increased gas turbulence in the chambers. I know the diameter makes some difference- (5.56 through a 7.62 can isn't near a quite as a 5.56 can).... just curious :-)
My m4-1000 07 model appeared to have baffles that progressively opened up as they approached the end cap. I could only measure the end cap with my Calipers and it was around .300" if I remember correctly... (for a 5.56 can)
Royalflush
12-05-12, 10:17
so the end cap is apprx 35-40% larger than the projectile in the case of your can.
very cool to know! thank you :-)
The 5.56 is not that much quieter in a 5.56 can as a 7.62 can. So that can stop here. But markm is correct IIRC
Obviously I'd never fire a 9mm through a 5.56 can, but I was kind of curious about the dimensions.
You wouldn't be the first :)
Just "theorizing" a little about how they work- if a tighter "channel" would lead to increased gas turbulence in the chambers. I know the diameter makes some difference- (5.56 through a 7.62 can isn't near a quite as a 5.56 can).... just curious :-)
Yes, a smaller bore allows the bullet to act as more of a stopper between baffles. In that instant in time the bullet is coaxial to the baffle, the faster gasses have no choice but to divert other directions.
Smaller bored cans are quieter. But have a higher risk of baffle strikes. So it's a trade-off. AAC (and others?) uses an electrified wire (EDM) to taper cut (make a cone) in their cans that allows for a small bore up front where the bullet has the least deviation from the muzzle and opens up more at each baffle.
There are some really small bored cans out there for their calibers. There are some giants as well, like .35" for a 223 can somewhere iirc.
The mount plays in as well. A thread mount can should be allowed to have a smaller bore than say a shitty AAC 18T that wobbles all over the place (the kind markm mentioned). So there are no "rules" as to what bore should or can be.
The 5.56 is not that much quieter in a 5.56 can as a 7.62 can. So that can stop here. But markm is correct IIRC
Correct, but they are quieter, and more importantly lighter and smaller, should probably have less flash but potentially more blowback. I see a lot of people absolutely recommending 762 cans without considering anything but sound. Which as you pointed out is not that important for the 556 round.
Royalflush
12-05-12, 16:18
You wouldn't be the first :)
Yes, a smaller bore allows the bullet to act as more of a stopper between baffles. In that instant in time the bullet is coaxial to the baffle, the faster gasses have no choice but to divert other directions.
Smaller bored cans are quieter. But have a higher risk of baffle strikes. So it's a trade-off. AAC (and others?) uses an electrified wire (EDM) to taper cut (make a cone) in their cans that allows for a small bore up front where the bullet has the least deviation from the muzzle and opens up more at each baffle.
There are some really small bored cans out there for their calibers. There are some giants as well, like .35" for a 223 can somewhere iirc.
The mount plays in as well. A thread mount can should be allowed to have a smaller bore than say a shitty AAC 18T that wobbles all over the place (the kind markm mentioned). So there are no "rules" as to what bore should or can be.
This was very helpful! Thank you.
Pretty much exactly answered the question in my mind which i poorly delivered to the keyboard.
Happy to. Although I used wrong word when I said coaxial, as the bullet is always coaxial to the baffles, I'm not sure what the exact word would be (sort of co-linear I guess), but you seem to get it.
I did forget to mention that if you buy a shitty can, you'll end up learning all about that can's mount, it's construction, what you do about baffle strikes / end cap kisses, features, bore size, flaws, and at least the idea is that if you buy a good can you'll never need to know any of that, it'll just work.
Fwiw, I was done ****ing around so I pony'ed up and bought the surefire socom cans. I don't and most likely will never care what the bore diameter on those cans are.
everyusernametaken
12-05-12, 17:22
Correct, but they are quieter, and more importantly lighter and smaller, should probably have less flash but potentially more blowback. I see a lot of people absolutely recommending 762 cans without considering anything but sound. Which as you pointed out is not that important for the 556 round.
One consideration I'll add to that line of thought is versatility - a 7.62 can may be a compromise for 5.56 use when it comes to weight/size, but if a user would like to be able to use their suppressor on a 300BLK or 308 host as well, then the additional weight and length may be acceptable. The AAC SDN6 is 1" longer than the M42K, and only a couple ounces heavier. Based on the specs, the SF 762RC is over 2" longer than the 556RC, so it's getting to be more of a compromise with those models. Either way, I wouldn't shut down the multi-caliber idea completely.
One consideration I'll add to that line of thought is versatility - a 7.62 can may be a compromise for 5.56 use when it comes to weight/size, but if a user would like to be able to use their suppressor on a 300BLK or 308 host as well, then the additional weight and length may be acceptable. The AAC SDN6 is 1" longer than the M42K, and only a couple ounces heavier. Based on the specs, the SF 762RC is over 2" longer than the 556RC, so it's getting to be more of a compromise with those models. Either way, I wouldn't shut down the multi-caliber idea completely.
Of course. I'm just saying there is a place for a 556 can.
Now... 556Socom vs 762Socom Mini, those are identical dimensions just with a 556 vs 762 bore, that's harder yet.
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