KelTec Sub 2000 9mm question on spent brass.

[GigaBuist]

I picked up a KelTec Sub 2000 in 9mm that takes Glock makes this past Friday and took it to the range on Saturday. I have a couple observations/questions for those familiar with the firearm.

First, aside from a stovepipe on the 10th round; zero malfs in the first 150 rounds I put through the thing. Much fun was had by me, and the Boy Scouts that happened to be at the shooting bench. I like the thing.

BUT... after my first mag I colllected some of the brass for inspection. It didn't appear to be bulged out, so that's good, but it was -really- dirty. Seemed to stay that way the whole day too. The brass was also "flat" on one side, not much, just a few millimeters of flatness which would probably be attributed to the ejection of the rounds, but I thought I'd ask here about it. Just want to make sure there's nothing dangerous about shooting this thing!

I was shooting the UMC Remmington bulk pack ammo that comes in 250 round boxes.

The only other 9mm I own is a CZ-75B, which has a rather tight chamber. I've never seen brass come out with so much soot on them before. I don't know if this is cause for concern or not.

I didn't do a stellar white-glove inspection proof cleaning on the thing before I took it out, so perhaps I had a bit of grease in the chamber that was being burned through. Still, I wonder if it's a regular occurancy in this firearm. Is the chamber just that loose that gas escapes backwards and dirties up the casings?

Thoughts?

 

[esldude]

Well mine shoots dirty too. I don't think it is loose enough gas is escaping. Just that long barreled blowback weapons are dirty by nature. My PC9 gets similarly dirty. I haven't noticed any mangling of the brass on mine or the PC 9.

Too bad no one, to my knowledge, makes a gas operated carbine.

 

[Badger Arms]

If you've never fired a blowback before, you might be a bit alarmed at the dirty brass. What happens is, as the round is 'blown back' by the expanding gas sending the bullet in the other direction, it breaks contact with the sides of the chamber much earlier than a locked-breech weapon such as a browning tilting barrel pistol. Because of this, all of the soot from the primer, powder, and vaporized bullet materials is still under relatively elevated pressures and gets deposited on the case, bolt, receiver, etc. This is more pronounced as the 9mm Luger is actually a tapered case.

As for the 'flattening' that you mention, it's probably just a result of the energetic ejection of the case striking the case deflector which is built into the receiver. Enjoy your new gun.

 

[Highpower1]

Mine too puts out some nasty brass, smiles but nothing that a little media and a tumbler won't fix.

So how did yours group for you? I have mine in the shop right now getting threaded for my AWC suppressor. I can't wait to try this out after I get it back.

 

[GigaBuist]

Ahhhh, okay, that makes sense. Phew.

Highpower, don't know how it groups really. Seemed to shoot low at 25 yards for me, but that just might be from me having an off sight picture. Seems like they designed it to fit a 10 year old Chinese boy.

I didn't put it on a bench at all yet, just played with it offhand and basically destroyed a target.