Suppressors Suppressor over pressure?

[Scubamax]

Recently started shooting with a can. Bullet casing after shooting looks like it’s tarnished. What’s going on?

 

[nn8734]

Looks dirty which is normal to an extent. These fired in a semi auto?

If so, where was the ejection pattern (3-4 o’clock is normal, indicative of acceptable pressures).

What can are you using?

Factory or hand loads?

 

[Scubamax]

Rifle was cleaned hours before these shots. Semi auto ar10. Barnes ttsx factory loads. Dead air sandman. I didn’t notice where cases flew. I was in a box blind. I plan to go to the range soonish.... i have an adjustable gas block. First can on semi auto.

 

[nn8734]

No problem, semi autos and suppressors can be tricky. Adjust your gas block until the ejection pattern is at 3-4 o’clock and watch for pressure signs. If it groups, ejects at 3-4 consistently with none of the usual pressure indicators on the brass you should be fine.

Gas blowback will dirty the brass, esp if the can itself generates lots of back pressure (most do but KAC and SF manage back pressure well at the cost of overall sound suppression)

 

[Zak Smith]

Gas is held back so it coats the case or cartridge with soot

 

[hafejd30]

Yup my Rock River LAR8 cases look the same. Running a TBAC Ultra 9 and a tuned Superlative Arms gas block

 

[diving dave]

If you reload, the combo of a gas gun and a suppressor will make you love your brass tumbler.

 

[Kayakfish1]

My rugged surge does that on my 14.5 urgi build with an adjustable block tuned without the can so it's a little gassy

 

[Alarka]

Normal on a DI AR with can.

 

[Zak Smith]

Fire a round from a bolt gun and quickly chamber the next round, let it sit. It will look similar.

 

[jcam]

Brass shot with OBR 308 & Ultra7

 

[YammyMonkey]

Completely normal. The magazine will also get dirty, not a big deal.

 

[jcam]

Completely normal. The magazine will also get dirty, not a big deal.

Agreed completely normal.

 

[FUNCTIONAL]

shoot an SBR suppressed...some cases youll wonder if its steel case or brass case.