Definite manufacturing issue with 2k9 mag

[Henchman]

Trying to get to the bottom of my 2k9 issue of not being able to get it up to a proper velocity, I decided to make a quick measurement.
And they're is definitely a manufacturing prolblem.
I measured inside the body from whe the valve ring in a regular mag body is, to whe the field screw goes. It was about 2 3/4 inches.
With the 2k9 it's 3 inches.
Thats a huge difference with the small tolerances Automags work under.

Can anyone here with a 2k9 and a standard mag, checkmy measurements.
If those with proper functioning 2k9's report different numbers then I can only surmise that some of these we not milled correctly.

[OPBN]

Measured a ULE and MiniMag body, both came in at about 2 7/8" to the front of the FS hole. Measured my MM2K9 without the insert and came in around 2 15/16, With the insert it is closer to 2 3/4, but probably because there is a lip on the insert keeping the tape measure from going in the extra 1/16 of an inch. I chrono fine. 285/290 all day long.

[Henchman]

Measured a ULE and MiniMag body, both came in at about 2 7/8" to the front of the FS hole. Measured my MM2K9 without the insert and came in around 2 15/16, With the insert it is closer to 2 3/4, but probably because there is a lip on the insert keeping the tape measure from going in the extra 1/16 of an inch. I chrono fine. 285/290 all day long.

Mine is 3" with the insert.

[OPBN]

Just so we are on the same page, I am using a tape measure that just fits inside of the body. I am sliding it in until it hits something. In this case it's the lip from the insert.

[Henchman]

Rechecked my measurements,also using a tape measure.
I am measuring from where the spring will hit the insert on the 2k9, and the metal insert on the ule body.

The ULE ring to the FS is 3 1/2 "
The 2k9 ring to the FS is 3"

[Henchman]

OPBN, when you look into the breach, what do you estimate the thickness of aluminum from the insert to where the removable breach is? Mine is about a 1/4" of aluminum.

[OPBN]

Rechecked my measurements,also using a tape measure.
I am measuring from where the spring will hit the insert on the 2k9, and the metal insert on the ule body.

The ULE ring to the FS is 3 1/2 "
The 2k9 ring to the FS is 3"

Ive measured 3 seperate bodies and all of them are 2 7/8 to the front of the FS hole. If you are getting 3 1/2" something is wrong. The spring sits on the inside of the insert, my tape measure will not fit inside the insert, so I am measuring from the lip. Before you were saying the MM2k9 was longer, now you are saying its shorter?

[Henchman]

Ive measured 3 seperate bodies and all of them are 2 7/8 to the front of the FS hole. If you are getting 3 1/2" something is wrong. The spring sits on the inside of the insert, my tape measure will not fit inside the insert, so I am measuring from the lip. Before you were saying the MM2k9 was longer, now you are saying its shorter?

Im sure my tape measure is a little off.
The big issue is the discrepency between the two different bodies, using the same tape measure.

Coudl you look down teh feedneck, and see rough how thick teh aluminum is where teh insert sits against. I have a sneaky suspicion that some offense bodies were not milled down far enough inside. Causing some of them to not work properly, because there is too much pressure because the bolt can not slide in far enough.

[zondo]

With ring:


Without ring:


I have yet to be able to get mine over 260 fps.

*EDIT*
Here is a ULE body on a Noxious rail:


I have no issues adjusting upwards of 300 fps with this.

Anyone have a good set of calipers to measure the ID of the MM2k9 and compare with another body?

*EDIT2*
Found my calipers and measured 6 times apiece. only measured right at the entrance of the body, not inside.

ULE= 1.0080, 1.0000, 1.0035, 1.0070, 1.0090, 1.0055 for an avg of 1.0055

MM2K9= 1.0020, 1.0030, .9990, .9945, .9990, 1.0000 for an avg of .9996

Curious if anyone found any difference with theirs. Incidentally, the OD on the widest portion of my L10 bolts are .9770.

[RT Lover]

the ptp mag seems to have some real issues with the 2k9 i thought ptp was fixing them? best thing is probably have xmagteror cut u a new body

[Henchman]

the ptp mag seems to have some real issues with the 2k9 i thought ptp was fixing them? best thing is probably have xmagteror cut u a new body

I think using a lathe to correct it, would most certainly be easier, and cheaper.

[RT Lover]

true if you can! Hope it works out man! maybe u can fix others also?

[OPBN]

My measurements on my AGD bodies are off. I realized from looking through the sear slot that they are not going fully forward due to my tape measure being too wide. Regardless, my measurements look the same as Zondos on my PTP and I can chrono fine.... Wonder why the difference?


*Edit - I found a thinner tape measure, and my ULE measures around 3 1/16 to the front of the hole with the ring and clip in. My MM2K9 measurements are still 2 7/8 with the insert and 3" without. Still looks very similiar to what Zondo is showing.

I tried measuring my ID and came up with measurements ranging from .9895 to .9760. The only part I can get a good measurement on is the side to side and it comes in at around .9880.

Also, I measured the L10 bolt that I am using and mine comes in at .9810.

Henchman, maybe someone else can get you the inner breach thickness. Honestly I am terrible at guestimating and hate disassembling this thing. The only way to get a good measurement is to take it totally apart and actually measure it.

Frizzle Fry mentioned that his steel washers had to be pressed in while mine and it seems others just dropped in. However, he has not mentioned any issue with velocity and neither have I.

[Henchman]

I am sending it to ptp, and they are going to check it out.
I'll let everyone know the outcome.

Mark

[zondo]

I am sending it to ptp, and they are going to check it out.
I'll let everyone know the outcome.

Mark

Meaning Tracy or Russel?