View Poll Results: Best Overall M4 Suppressor

Voters
143. You may not vote on this poll
  • KAC QDSS-NT4

    18 12.59%
  • Surefire FA556SA

    52 36.36%
  • AAC M4-2000

    73 51.05%
Page 4 of 10 FirstFirst ... 23456 ... LastLast
Results 31 to 40 of 99

Thread: M4 Suppressors

  1. #31
    Join Date
    Aug 2007
    Posts
    117
    Feedback Score
    12 (100%)
    Quote Originally Posted by Magic_Salad0892 View Post
    Maybe I got lucky. My KAC can (soon to be plural there) only has a 1.3'' shift vertically. (Up.)

    Does anybody have similar?

    I AAC can I had had a 4 shift even. (two inches right and two inches up)

    I do admit that the AAC can handled a little better on the LWRCi than the KAC did on the KAC.

    I'm sure it was because of the light weight muzzle device on the piston gun, vs the kind of heavier device on the lighter DI gun though. YMMV and all.

    Does your barrel have a 1:9 or 1:7 twist?

  2. #32
    Join Date
    Oct 2010
    Location
    Austin, TX
    Posts
    175
    Feedback Score
    1 (100%)
    Quote Originally Posted by C4IGrant View Post
    Right. DB rating with a gun shooting a bullet that breaks the sound barrier is pointless.

    All that really matters (to me) is POI of shift.

    Both of my AAC cans have a POI shift of about 3 inches at 100yds. Now that doesn't sound like a whole lot, but if I am shooting at someone at 200yds, now I am 6 inches off. This becomes a problem.


    C4
    Why would it be pointless? Breaking the sound barrier does not necessarily indicate a loud sound. It does mean that there will be pressure created, in the case of bullets the volume of this pressure is somewhat small and being pushed out in front and to the sides of the bullet - the shooter will not receive much of that pressure.

    On the downrange side of the shot, an observer close to the path of the bullet will hear the supersonic crack but depending on their orientation to the round passing they might be unable to correctly guess the direction the shot was fired from.

    One of the main reasons for a suppressed weapon is to mask the origin of the shot to prevent detection and aid in follow up shots.

    I've seen a chart that indicated the approximate dB for the supersonic crack of a .308 round fired from 1300fps to 3700fps is right at 140 in all cases measured 10yds from the target line . Therefore lowering the muzzle report from ~160dB to ~130dB with a suppressor makes a huge difference in overall loudness to a close observer.

    Vinson
    Last edited by vinsonr; 01-27-11 at 16:59. Reason: clarification

  3. #33
    Join Date
    Mar 2010
    Location
    Maine
    Posts
    7,868
    Feedback Score
    0
    Quote Originally Posted by Jack_Bauer View Post
    Does your barrel have a 1:9 or 1:7 twist?
    KAC guns have lightweight 1/7 twist CHF barrels.
    We miss you, AC.
    We miss you, ToddG.

  4. #34
    Join Date
    Mar 2009
    Location
    Deep South Texas
    Posts
    2,521
    Feedback Score
    2 (100%)
    Quote Originally Posted by vinsonr View Post
    Why would it be pointless? Breaking the sound barrier does not necessarily indicate a loud sound. It does mean that there will be pressure created, in the case of bullets the volume of this pressure is somewhat small and being pushed out in front and to the sides of the bullet - the shooter will not receive much of that pressure.

    On the downrange side of the shot, an observer close to the path of the bullet will hear the supersonic crack but depending on their orientation to the round passing they might be unable to correctly guess the direction the shot was fired from.

    One of the main reasons for a suppressed weapon is to mask the origin of the shot to prevent detection and aid in follow up shots.

    I've seen a chart that indicated the approximate dB for the supersonic crack of a .308 round fired from 1300fps to 3700fps is right at 140 in all cases measured 10yds from the target line . Therefore lowering the muzzle report from ~160dB to ~130dB with a suppressor makes a huge difference in overall loudness to a close observer.

    Vinson
    you are taking to much out of that one comment...i'm not one to speak for the boss but a couple of db's between the cans listed means squat compared to holding poi for what grant needs in his application.
    "You cannot invade the mainland United States. There would be a rifle behind each blade of grass."
    Japanese Admiral Yamamoto, 1941




    "A wise man's heart directs him toward the right, but a foolish man's heart directs him toward the left."
    Ecclesiastes 10:2:

  5. #35
    Join Date
    May 2006
    Location
    VA/OH
    Posts
    29,630
    Feedback Score
    33 (100%)
    Quote Originally Posted by JasonAAC View Post
    SF uses M855 for their testing since it is the current MIL round.

    As an aside, while I agree that arguing over 1 or 2 dB with a supersonic round is not productive, I do think that dB ratings factor heavily into the picture- sure, the bullet flight is loud, but the difference at the muzzle between 135 and 145 is huge in terms of the shooter's experience. if sound doesn't matter with a supersonic round, why even have a can at all?

    Another note, the average shooter will never ever burn out the KAC, AAC, or SF can.

    It can be huge, but as long as is it is hearing safe (16" gun), then I am not sure that it really matters and if it isn't hearing safe (like on a 10.5 AR), then it REALLY doesn't matter as you will be wearing hearing protection any way.

    From a training standpoint, the odds that everyone in a carbine class will be running a can is about zero. So you are will always be wearing ears. So again, 1-15db difference does not matter.

    What does matter is being in that same carbine class, deciding to remove your can and shoot at 10" targets at over 200yds and still being able to hit the target.


    C4
    Last edited by C4IGrant; 01-28-11 at 11:56.

  6. #36
    Join Date
    May 2006
    Location
    VA/OH
    Posts
    29,630
    Feedback Score
    33 (100%)
    Quote Originally Posted by Magic_Salad0892 View Post
    Maybe I got lucky. My KAC can (soon to be plural there) only has a 1.3'' shift vertically. (Up.)

    Does anybody have similar?

    I AAC can I had had a 4 shift even. (two inches right and two inches up)

    I do admit that the AAC can handled a little better on the LWRCi than the KAC did on the KAC.

    I'm sure it was because of the light weight muzzle device on the piston gun, vs the kind of heavier device on the lighter DI gun though. YMMV and all.
    My two AAC cans have about a 3 inch shift.


    C4

  7. #37
    Join Date
    May 2006
    Location
    VA/OH
    Posts
    29,630
    Feedback Score
    33 (100%)
    Quote Originally Posted by vinsonr View Post
    Why would it be pointless? Breaking the sound barrier does not necessarily indicate a loud sound. It does mean that there will be pressure created, in the case of bullets the volume of this pressure is somewhat small and being pushed out in front and to the sides of the bullet - the shooter will not receive much of that pressure.
    You cannot suppress the sound barrier jump. So you are always going to get a loud noise that is sometimes hearing safe and sometimes not (depending on barrel length).

    On the downrange side of the shot, an observer close to the path of the bullet will hear the supersonic crack but depending on their orientation to the round passing they might be unable to correctly guess the direction the shot was fired from.
    Sure.

    One of the main reasons for a suppressed weapon is to mask the origin of the shot to prevent detection and aid in follow up shots.
    Correct AND flash suppression. Splitting hairs ove a couple DB's though when POI shift is a more important issue is my point.



    C4
    Last edited by C4IGrant; 01-28-11 at 12:01.

  8. #38
    Join Date
    May 2009
    Posts
    88
    Feedback Score
    0
    I've noticed a big difference in zero shift when using different ammunition types as well.

    With my AAC M4-2000, I get a 4:30 3" shift with XM-193 bullets, but with 75 and 77 gr bullets, the shift is reduced to 1"

  9. #39
    Join Date
    Sep 2007
    Location
    AZ
    Posts
    27,216
    Feedback Score
    14 (100%)
    The same can will give different POI shifts on different guns. My M4-1000 puts my POI 1" high at a hundred on one 14.5" barrel, and 4-5" low on another 14.5" barrel.

    POI shift claims by companies should be about as valuable to you as their Db claims....

  10. #40
    Join Date
    May 2006
    Location
    VA/OH
    Posts
    29,630
    Feedback Score
    33 (100%)
    Quote Originally Posted by markm View Post
    The same can will give different POI shifts on different guns. My M4-1000 puts my POI 1" high at a hundred on one 14.5" barrel, and 4-5" low on another 14.5" barrel.

    POI shift claims by companies should be about as valuable to you as their Db claims....
    Correct. That is why I test all can's on the SAME barrel.

    With SF cans, RARELY have I seen anything on over 1MOA on many different barrels. I have also compared notes with other C3 dealers and they report the same (in regards to SF cans having small POI shifts).

    On the other hand, the smallest POI shift I have ever seen for a NON SF can is 1MOA, with the average being around 3-4MOA.


    C4
    Last edited by C4IGrant; 01-30-11 at 16:10.

Page 4 of 10 FirstFirst ... 23456 ... LastLast

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •