I just picked up a used but in good shape Stag Arms 3T with the plus package.

 

The brass is ejecting at 1:00 and dinging up the rim of the brass making reloading questionable.

out of 100+ rounds, not one failure of any kind using two types of common 5.56, 55 grain rounds.

 

The problem is it is nicking the starting edge of the shell deflector as well as messing up the rim of the brass.

The picture below is not my rifle but just to show where the rim of the shells are hitting. Any suggestions greatly appreciated!

Please click on the pic to enlarge.

 

It's over gassed. Try a heavier buffer.

An over-gassed Stag rifle? Color me shocked.

 

Heavier buffer and heavier action spring will help, or you can re-barrel it.

 

As far as the dings/nicks - don't worry about it. It shows the rifle is used. That part is supposed to get beat up by brass.

HE, He wants to reload the brass though. (HE, He? I made a funny,lol)

 

 

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It has the plus features of a heavy buffer, the barrel to 1/7 twist 4150 steel, and the semi auto bolt carrier to an M16 bolt carrier.  The bolt and barrel are HP/MP tested.

Get a heavier spring to start. Then maybe go to an H2 buffer. Not unusual for a Stag gas port to be WAY oversized.

An over-gassed Stag rifle? Color me shocked.

 

Heavier buffer and heavier action spring will help, or you can re-barrel it.

 

As far as the dings/nicks - don't worry about it. It shows the rifle is used. That part is supposed to get beat up by brass.

HE, it has the heavy buffer and action spring.

 

"As far as the dings/nicks - don't worry about it. It shows the rifle is used. That part is supposed to get beat up by brass."

Beat up by brass is okay. Beat up THE brass is not okay.

Ah, gotcha.

 

Some gun makers oversize the gas holes in their barrels so it will run on out of spec underpowered cheap Ammo.

 

Two easy ways to fix it -

1) Replace the barrel with one with an in-spec gas port

 

2) Replace the gas block with an adjustable model. JP makes a nice 2 piece adjustable model that clamps on.

HE,  Can I get a link to the JP 2 piece gas block you mentioned? Thank you. The Stag 3T has a very low profile, free floating hand guard so I want to be sure it will fit.

Here ya go:

https://www.jprifles.com/buy.php?item=JPGS-9

 

I just installed one on a rifle I had with an under gassed issue (the gas block shit the bed for some reason). Rifle runs like a sewing machine now.

HE, Thanks for the quick response. I will try to get Stag to fix this issue with their "lifetime warranty," If that is a no go, I will buy the gas block from JP.

I respect your opinion more than you know. You seem to have at great knowledge of the AR platform.

Thanks for the kind words.

 

I think contacting Stag first is a smart move.

 

Good luck, let us know how it turns out.

There are also multiple adjustable gas keys on the market if getting the gas block off is a pita.

 

I have one from rubber city armory

Thanks everyone for the suggestions. I called Stag Arms and they issued an RA and sent a UPS label to ship it back to them for repair.

Hopefully the repairs will be covered by their lifetime warranty.

I shipped the rifle back to Stag last Monday and got it back on Friday. Kudos to Stag Arms for their quick turnaround.

 

Stag Wrote,

REPAIR INFORMATION
Repairs completed: 5/12/2016
Testing information: 2 x 30 Round Magazines
Notes: Adjusted gas block and gas tube. Test fired with multiple magazines and brass was not hitting
deflector. Gas port is 0.070 which is standard for a 16" barrel. Rifle up to factory spec.

 

I took it to the range yesterday and though perhaps very slightly better. Ejecting at 2:00, the brass is still hitting the start of the deflector

and marking up the rim of the brass. I have a Stag H1 buffer and spring in it but have now ordered a Sprinco Blue carbine spring and a

Spike's ST-T2 buffer. I am hoping this combination solves the problem, if not I will go for the JP adjustable gas block.

 

Although Stag's turnaround was quick, Their service was not so great. They claimed to adjust the gas block and gas tube but I examined the rifle closely

and I don't see anything that they could have adjusted to make it less gassed! Are they just full of crap?

I'm confused. The brass deflector is not at 2. Is it ejecting at 2 because it's hitting the brass deflector? Is the brass actually coming out rearward (say 5) and deflecting forward? Post a pic of the brass too so we can see if there's a potential reloading issue. If the neck is slightly dinged it will be fine.

I'm confused. The brass deflector is not at 2. Is it ejecting at 2 because it's hitting the brass deflector? Is the brass actually coming out rearward (say 5) and deflecting forward? Post a pic of the brass too so we can see if there's a potential reloading issue. If the neck is slightly dinged it will be fine.

 

The brass is ejecting at about 5:30 and hitting the starting edge of the deflector (see first post) and bouncing forward at about 1 to 2 :00 landing forward of the firing line.

Okay, got my Sprinco blue buffer spring and Spikes ST-T2 heavy buffer. Took it to the range today and 5.56 is ejecting at about 2:30 and .223 at about 4:30.

I guess I will leave it be for a while and continue to test with different ammo.