Suppressor for a firearm

1. A suppressor for a firearm, comprising:

a casing having a front end and defining a longitudinal axis;

a first plurality of baffles inside said casing;

a front cap downstream from said first plurality of baffles at said front end of said casing;

a first retainer connected to said casing and disposed between said first plurality of baffles and said front cap, wherein said first retainer has an upstream surface and a downstream surface, and wherein said first plurality of baffles, said front cap, and said upstream surface of said first retainer define a fluid pathway along said longitudinal axis;

a contoured wall that extends axially upstream from said upstream surface of said first retainer, wherein said contoured wall defines a plurality of damping wells in said upstream surface of said first retainer radially disposed from said fluid pathway; and

wherein said downstream surface of said first retainer is symmetrical with said upstream surface.

2. The suppressor as in claim 1 , further comprising a substantially flat surface on said upstream surface of said first retainer between said contoured wall and said fluid pathway.

3. The suppressor as in claim 1 , further comprising a first annular compression ring between said first plurality of baffles and said first retainer.

4. The suppressor as in claim 1 , further comprising a second plurality of baffles inside said casing and downstream from said first retainer.

5. The suppressor as in claim 4 , further comprising a second retainer connected to said casing and disposed between said second plurality of baffles and said front cap.

6. The suppressor as in claim 5 , wherein said second retainer is identical to said first retainer.

7. The suppressor as in claim 5 , further comprising a second annular compression ring between said second plurality of baffles and said second retainer.

8. The suppressor as in claim 1 , wherein said front cap has an axial length and a cylindrical tube extends upstream in said front cap more than 50% of said axial length of said front cap.

9. A suppressor for a firearm, comprising:

a casing having a front end and defining a longitudinal axis;

a plurality of baffles inside said casing;

a front cap downstream from said plurality of baffles at said front end of said casing, wherein said front cap defines an axial length;

a first retainer in threaded engagement with said casing and disposed upstream from said plurality of baffles;

a second retainer in threaded engagement with said casing and disposed downstream from said plurality of baffles and upstream from said front cap, wherein said plurality of baffles, said front cap, and said first and second retainers define a fluid pathway along said longitudinal axis;

wherein each retainer comprises:

an upstream surface and a downstream surface;

a plurality of apertures through said upstream and downstream surfaces and radially disposed from said fluid pathway, wherein said plurality of apertures provide fluid communication through said upstream and downstream surfaces; and

wherein said downstream surface of each retainer is symmetrical with said upstream surface.

10. The suppressor as in claim 9 , further comprising a substantially flat surface on said upstream surface of each retainer between said plurality of apertures.

11. The suppressor as in claim 9 , further comprising an annular compression ring upstream from each retainer.

12. The suppressor as in claim 9 , further comprising a cylindrical tube in said front cap that extends upstream in said front cap more than 50% of said axial length of said front cap.

13. A suppressor for a firearm, comprising:

a casing having a front end and defining a longitudinal axis;

a front cap at said front end of said casing, wherein said front cap has an axial length and a cylindrical tube extends upstream in said front cap more than 50% of said axial length of said front cap;

a first retainer in threaded engagement with said casing and disposed upstream from said front cap, wherein said first retainer has an upstream surface and a downstream surface,

a first plurality of baffles inside said casing and upstream from said first retainer, wherein said front cap, said first retainer, and said first plurality of baffles define a fluid pathway along said longitudinal axis;

a substantially flat surface extends radially outward from said fluid pathway on said upstream surface of said first retainer; and

wherein said downstream surface of said first retainer is symmetrical with said upstream surface;

and further comprising a first annular compression ring between said first plurality of baffles and said first retainer.

14. The suppressor as in claim 13 , further comprising a second plurality of baffles inside said casing and downstream from said first retainer.

15. The suppressor as in claim 14 , further comprising a second retainer in threaded engagement with said casing and disposed between said second plurality of baffles and said front cap.

16. The suppressor as in claim 15 , wherein said second retainer is identical to said first retainer.

17. The suppressor as in claim 13 , wherein said cylindrical tube has an upstream end with an arcuate relief in said upstream end of said cylindrical tube.