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M11-A1 ejecting - what's normal?

This is a discussion on M11-A1 ejecting - what's normal? within the SIG Sauer Pistols forums, part of the SIG Sauer Forum category; I recently bought a BNIB M11-A1 about a month back. Took it out to the range a few weeks ago and put about 150 rounds ...


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Old 09-13-2016, 07:36 PM   #1
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M11-A1 ejecting - what's normal?

I recently bought a BNIB M11-A1 about a month back. Took it out to the range a few weeks ago and put about 150 rounds through it. (Outside range and it was blazing hot in Texas) Is it normal for this weapon to eject spent casings straight back into my neck/face area? My P239 spits 'em out well clear.
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Old 09-14-2016, 12:59 AM   #2
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Not normal.
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Old 09-14-2016, 01:51 AM   #3
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Woody8079, I would suspect low slide velocity to be the reason, but as to the cause, it could either be low powered ammunition, a lack of sufficient lubrication, or too strong of a recoil spring. Since Sigs 229 recoil spring for .357/.40 is a lot heavier than their 9mm version, if it was in there you would have a lot of stovepipes, and that's not your problem.
Your description of it being blazing hot temperature wise leads me to suspect lubrication.
If you have read many of the threads dealing with lubrication, you will note that "Grease" is recommended for the slide rails, and oil for hammer, trigger, etcetera. As has been stated many times, if it slides use grease, if it rotates use oil.
If that's not the case, then I would look at the ammunition used. When a gun is new, and tight, needing to be broken in, some 9mm "plinking ammo" may not be up to the task. While they may work fine in another weapon, that has been broken in and a little looser, they don't have the "energy" to operate reliably a new weapon.
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Old 09-14-2016, 09:15 AM   #4
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Originally Posted by Willard View Post
Woody8079, I would suspect low slide velocity to be the reason, but as to the cause, it could either be low powered ammunition, a lack of sufficient lubrication, or too strong of a recoil spring. Since Sigs 229 recoil spring for .357/.40 is a lot heavier than their 9mm version, if it was in there you would have a lot of stovepipes, and that's not your problem.
Your description of it being blazing hot temperature wise leads me to suspect lubrication.
If you have read many of the threads dealing with lubrication, you will note that "Grease" is recommended for the slide rails, and oil for hammer, trigger, etcetera. As has been stated many times, if it slides use grease, if it rotates use oil.
If that's not the case, then I would look at the ammunition used. When a gun is new, and tight, needing to be broken in, some 9mm "plinking ammo" may not be up to the task. While they may work fine in another weapon, that has been broken in and a little looser, they don't have the "energy" to operate reliably a new weapon.
I was feeding Winchester 115grain and Hornady Critical Defense 115grain. I'll lubricate and go for another test run. I'll put more rounds down and see if it loosens up. Thanks for the feedback.
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Old 09-14-2016, 09:34 AM   #5
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I've owned an M11-A1 and a Legion P229-1 that ejected right into my face. The solution is simple, but a bit expensive.

Since the recoil spring must accommodate regular pressure rounds and +P rounds, it is a bit on the stiff side for 9mm. The use of lots of lube and grease with +P rounds accelerated the break in. (Be sure to lube the guide rods on the Legions as the coating on them adds friction.) After wear in, this bad behavior stops due to the accelerated slide speed during recoil.

Bill
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Old 09-14-2016, 09:38 AM   #6
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I've had one or two that ejected right back and over my head. Nothing to be concerned about in my case. That's one or two times out over 400 rounds. Still breaking it in. I don't use +P.
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Old 09-14-2016, 09:55 AM   #7
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The M11-A1 has phosphated internals and a phosphated barrel. This seems to add a little bit of friction in the chamber which slows slide speed. Law enforcement ammo usually has nickel plated cases which may help with ejection. Hornady Critical Duty in 135 gr. may work as well as +P, but I haven't tried it for this specific problem.

Bill
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