Go Back   CMP Forums > CMP Sales > M1 Carbine
Register FAQ Members List Calendar Mark Forums Read

Reply
 
Thread Tools Display Modes
  #1  
Old 11-13-2017, 04:13 PM
slimedog slimedog is offline
 
Join Date: Dec 2009
Posts: 44
Default Carbine ejection question

Hi friends,

A couple years ago, I picked up a Blue Sky Imports carbine. The rifle, (Inland) was in kind of rough shape (but had all GI parts) and had ejection issues (FTE, double feeds, stovepipes). I stopped shooting it after an empty case was actually driven and stuck into the handguard.

So, I finally sent it off the CMP Custom Shop for inspection, a new barrel and reparking. I also put a walnut CMP stock on it. While I will post a full review with pictures, let just me say that it came back looking GREAT. The Custom Shop mentioned that the ejector spring was out of spec and replaced it. I ran 100 rounds of American Eagle 110g FMJ through it this weekend with no hangups.

The only issue was erratic ejection. My ARs and Garands tend to put brass into neat, little piles 6 feet away at around 3 and 2 o'clock, respectively. The carbine puts brass randomly between 12 and 6 o'clock, occasionally hitting me in the head. Sometimes ejected with authority, sometimes barely squirted out onto the bench a few inches from the rifle. While every case did make it out, I wonder if I have a geometry or spring issue.

So, experienced carbine users - should I expect consistent ejection or is this normal and acceptable behavior? Thanks!
Reply With Quote
  #2  
Old 11-13-2017, 05:34 PM
HB of CJ HB of CJ is offline
 
Join Date: Nov 2011
Location: 42N -123W OR USA Kinda
Posts: 1,230
Default Easy To Tune ...

We must understand that normally the fired cases usually hit and bounce off the slide in ordinary conditions? This results in strange ejection patterns with the USGI Carbine?

What you can do is polish the bottom half of the bolt face rim. Also make sure the ejector is slightly below the bolt rim. Also make sure the ejector bottoms below the bolt FACE.

Both sides of the extractor can also be polished. Just try not to remove any material. Only polish. Finally both feed ramps can also be polished. Same thing. Do not remove.

What is attempted to be accomplished is creating conditions where the chaotic ejection somewhat becomes less so. To the point where the brass kinda goes the same place.

We tend to use factory Sellier and Bellot (horribly misspelled?) and Prvi Partizan, (sp?) ammo. Ejection can be best described as erratically predictable. Generally one pile.

Last edited by HB of CJ; 11-14-2017 at 07:03 PM. Reason: w/w
Reply With Quote
  #3  
Old 11-13-2017, 05:38 PM
6 Ring 6 Ring is offline
 
Join Date: Apr 2010
Location: South of Atlanta, Ga
Posts: 3,056
Default

Carbine brass can go anywhere. The type of slide also changes things. The type 5 slide mostly keeps the hot cases from bouncing off your forehead or going down your collar.
I agree, "one pile" from six feet in front to six feet back.
Reply With Quote
  #4  
Old 11-13-2017, 05:51 PM
meplat meplat is offline
 
Join Date: Jan 2010
Location: Prescott, AZ
Posts: 3,817
Default

Quote:
Originally Posted by slimedog
The only issue was erratic ejection. My ARs and Garands tend to put brass into neat, little piles 6 feet away at around 3 and 2 o'clock, respectively. The carbine puts brass randomly between 12 and 6 o'clock, occasionally hitting me in the head. Sometimes ejected with authority, sometimes barely squirted out onto the bench a few inches from the rifle. While every case did make it out, I wonder if I have a geometry or spring issue.

So, experienced carbine users - should I expect consistent ejection or is this normal and acceptable behavior? Thanks!
My shooter puts them all pretty consistent out at 2PM, distance wise anywhere from 3' to almost 20'!

Your problem could be due to any number of things.

Are you using a late slide or early? The shape of the cam was changed so that riccochet (direction) of the spent case once extracted was more, err, consistent. Same with ejectors. If you aren't using the latest type, forget about ejection consistency.

Could be your carbine may also need a good cleaning. No telling how many rounds the good folks at the CMP needed to test your rifle. Most ammo tends to be pretty sooty.

Reply With Quote
  #5  
Old 11-13-2017, 10:58 PM
DaveHH DaveHH is offline
 
Join Date: Nov 2009
Posts: 4,704
Default

There are three shapes of ejectors each sends brass in a different direction. You might try one of each, they are cheap and are not marked to a maker like the extractor. Greasing the rails, the slide slot in the receiver side and the slots in the barrel will change the ejection spots. I use grease on mine.
Reply With Quote
  #6  
Old 11-14-2017, 04:24 PM
slimedog slimedog is offline
 
Join Date: Dec 2009
Posts: 44
Default

The rifle came back clean and well-lubricated from CMP. I will do some research on the actual parts tonight and post the results soon.

Thanks for the replies!
Reply With Quote
  #7  
Old 11-20-2017, 02:22 PM
HB of CJ HB of CJ is offline
 
Join Date: Nov 2011
Location: 42N -123W OR USA Kinda
Posts: 1,230
Default Ejector Patttern Fun Study? ...

Has anybody taken the time and fun to try all the different USGI ejectors and see where that pile of brass ends up? Be a fun project exercising our profound ability to not correctly use that USGI bolt tool.

Don't forget that necessary transparent containment plastic bag. A dry cleaning bag works. Amazing hang times with dinky parts. Lost in the carpet forever. But ... sometimes the cat or dog finds the stuff.

Edit: How come we can't correct the title speeeling?

Last edited by HB of CJ; 11-20-2017 at 02:23 PM. Reason: add
Reply With Quote
  #8  
Old 11-26-2017, 09:54 AM
ACampComLegacy ACampComLegacy is offline
 
Join Date: May 2012
Location: Snow Hill NC
Posts: 1,012
Default

Is it possible that even if it locks into battery, that the bolt lugs, or the bolt lug channels in the receiver are worn, and the bolt upon ejection is at different degrees of rotation each time???
__________________
Gramps; O-6 Dental Corp
Dad; O-5, 5 SFG
me; lowly E-x, Med Corp


Did any Americans STOP waving their US Flags on 09/11/01, because their arms were tired from waving it on 09/10/01?
Reply With Quote
  #9  
Old 01-24-2018, 01:24 PM
ACampComLegacy ACampComLegacy is offline
 
Join Date: May 2012
Location: Snow Hill NC
Posts: 1,012
Default

That's a 'yes', I'm guessing???

Quote:
Originally Posted by ACampComLegacy View Post
Is it possible that even if it locks into battery, that the bolt lugs, or the bolt lug channels in the receiver are worn, and the bolt upon ejection is at different degrees of rotation each time???
__________________
Gramps; O-6 Dental Corp
Dad; O-5, 5 SFG
me; lowly E-x, Med Corp


Did any Americans STOP waving their US Flags on 09/11/01, because their arms were tired from waving it on 09/10/01?
Reply With Quote
  #10  
Old 01-24-2018, 03:03 PM
meplat meplat is offline
 
Join Date: Jan 2010
Location: Prescott, AZ
Posts: 3,817
Default

I think speed of recoil, spring stiffness, and shape of both ejector and slide are all far more significant factors in brass placement than any fraction of a degree difference in bolt face / ejector orientation at the moment the spent case lifts free from the chamber and goes airborne. That being said, the brass ejection is a very "chaotic" system and I don't believe Ordnance Dept ever fully "resolved" the carbine's ejection "issues". It is what it is. While I've tried over the years to refine mine, I ALWAYS get the occassional "over the shoulder" case. Other than that, it's not "simple physics", it's actually "unpredictable"


Last edited by meplat; 01-24-2018 at 05:57 PM.
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On



All times are GMT -5. The time now is 04:21 AM.