9mm carbine, do compensators have any effect?
- Thread starter QuietMike
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GaryNC
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I have my first two silencers in ATF jail. Before my purchased, I had a friend demonstrate several different calibers including 9 mm. There is a reduction in noise with the silencer installed on 9 mm PCC with a 16" barrel. The biggest change on the 16" PCC was using sub-sonic rounds that had 147 grain projectile made the firearm much quieter without the super sonic crack.
1KPerDay
Member
Three reasons for a comp on a 16” PCC:
- Looks cool
- Make it louder for a shot timer to work properly
- Adds a bit of weight near the muzzle… MIGHT reduce perceived muzzle lift a tad (but also might make it harder to transition and stop quickly)
GunnyUSMC
Member
Most Muzzle brakes and compensators are designed to work at high pressures. The 9mm cartridge fired from a 16” barrel does not have a high enough pressure for most.
This is the same for any other cartridge that works at a lower pressure, such as the 458 SOCOM. I had my friend, Zack, at Aklys Defence design and build a muzzle brake for my 458 SOCOM build.
https://aklysdefense.com/products/parts-acc/bihm-brake-big-bore-muzzle-brake
This is what Zack came up with. It’s called the Bihm Brake. It was named after me, my last name is Bihm.
Zack explained that a cartridge that has a lower muzzle pressure needs a break with large expansion chambers to work efficiently. This muzzle break on me 458 SOCOM makes recoil feel like shooting 12ga Dove and quail loads.
I don’t remember the brand name of this muzzle break. I think I found it over at Midway USA. I put it on my 9mm carbide and it does reduce felt recoil and muzzle rise. But what amazed me was that it didn’t make the carbine louder, just different. Notice that it has a very large expansion chamber.
This is the same for any other cartridge that works at a lower pressure, such as the 458 SOCOM. I had my friend, Zack, at Aklys Defence design and build a muzzle brake for my 458 SOCOM build.
https://aklysdefense.com/products/parts-acc/bihm-brake-big-bore-muzzle-brake
This is what Zack came up with. It’s called the Bihm Brake. It was named after me, my last name is Bihm.
Zack explained that a cartridge that has a lower muzzle pressure needs a break with large expansion chambers to work efficiently. This muzzle break on me 458 SOCOM makes recoil feel like shooting 12ga Dove and quail loads.
I don’t remember the brand name of this muzzle break. I think I found it over at Midway USA. I put it on my 9mm carbide and it does reduce felt recoil and muzzle rise. But what amazed me was that it didn’t make the carbine louder, just different. Notice that it has a very large expansion chamber.
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They work really good. If you play with powder burn rate and bullet weight, you can pretty much tame down any dot/sight movement.
If you put one on a short barreled PCC they work even better.
If you put one on a short barreled PCC they work even better.
Crosshair
Member
Not worth the trouble unless you are playing at a Rambo match or have full-auto IMHO.
Tried a couple I have laying around, that came with various trades, on my PC-9 SBR. Went back to the plain thread protector. None of them made enough difference to justify the increased overall length and additional noise.
Tried a couple I have laying around, that came with various trades, on my PC-9 SBR. Went back to the plain thread protector. None of them made enough difference to justify the increased overall length and additional noise.
looking at the one I got, that I haven't installed yet, it has 3 small holes on the top - which I assume is to reduce and muzzle flip, and 3 very large holes on either side. My assuption is the redirection of air/gas from a forward direction to a side direction, places a forward nrg onto the compensator, and that is what reduces recoil if any. Instead of having that gas push back, some of it is controlled, and through the redirection, changes the effective direction of force applied from backward to forward - on some percentage of the escaping gas.
jmorris
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I couldn’t say that any change in muzzle device has no effect but I can tell you what the load is certainly plays a role.
My “minor” 9mm loads using 147gn bullets with very fast powders, won’t work the compensator much even in an open pistol but they already have low felt recoil/muzzle rise. 9mm major loads, using light bullets and slower powders, will keep a comped gun flat with a lot of blast though.
That said, your talking about a 9mm in a rifle, it’s not like it’s knocking you off your feet.
Most of the movement is from the reciprocating mass, lock your bolt back and aim at your intended target, hold that aim and drop the bolt. How far did it move from POA?
My “minor” 9mm loads using 147gn bullets with very fast powders, won’t work the compensator much even in an open pistol but they already have low felt recoil/muzzle rise. 9mm major loads, using light bullets and slower powders, will keep a comped gun flat with a lot of blast though.
That said, your talking about a 9mm in a rifle, it’s not like it’s knocking you off your feet.
Most of the movement is from the reciprocating mass, lock your bolt back and aim at your intended target, hold that aim and drop the bolt. How far did it move from POA?
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