The Ultimate STI 2011 Magazine Tuning Video from Atlas Gunworks
[00:00:00.02]
(smooth club music)

[00:00:06.03]
– [Adam] Hey everybody,
Adam from Atlas Gunworks.

[00:00:08.06]
We’re going to talk Gen
2 STI mag tuning today.

[00:00:12.01]
There’s a couple different parts to this,

[00:00:13.09]
but we’ll go through them all,

[00:00:15.00]
how we quickly do that tuning here.

[00:00:18.00]
This is a how to video
so you can retune mags

[00:00:20.08]
you bought from us, or you
can tune them from zero.

[00:00:23.05]
There should be enough information
here to do all of that.

[00:00:27.02]
This is a 2011 mag that we cut away

[00:00:29.03]
so we could see what was going on.

[00:00:30.09]
You can see that the
rounds are double-stacked,

[00:00:33.03]
right, double-stacked magazine.

[00:00:35.00]
At the top of a 2011 mag, the
last three rounds stack up

[00:00:38.06]
vertically in a single stack fashion.

[00:00:41.05]
So that being said, this
dimension here is critical.

[00:00:45.03]
And we need the bullets here to be nearly

[00:00:48.03]
on top of each other and not side by side.

[00:00:50.04]
When they get side by side,

[00:00:51.04]
the spring won’t have enough pressure

[00:00:52.08]
when the mag’s fully
loaded to overcome that.

[00:00:55.06]
So, a little bit of tuning here

[00:00:57.03]
goes a long way in making
these mags super reliable

[00:01:00.01]
and work really really well.

[00:01:01.08]
What to know about it is over time

[00:01:03.05]
as these mags hit the
ground and stay loaded,

[00:01:05.07]
they’re gonna give some of that back.

[00:01:07.00]
So, a retune probably every
six months is called for.

[00:01:10.00]
I retune all my mags
sets, the whole thing,

[00:01:11.09]
feed lips, everything,
A-Z, every six months.

[00:01:14.06]
So keep that in mind

[00:01:16.00]
but what we’re trying to do

[00:01:16.09]
is get this dimension square,

[00:01:18.00]
the feed lip dimension square,

[00:01:19.04]
and then this dimension
square so they fit in the gun.

[00:01:22.06]
So these are two mags
that we tuned earlier.

[00:01:25.04]
These have the dimensions on them.

[00:01:27.04]
So they’ll be there,
hopefully you can read them.

[00:01:28.09]
These are the feed lip dimensions,

[00:01:30.06]
three, five, five to three.

[00:01:32.06]
And I want three..10 minus 10 in the back,

[00:01:34.06]
so 345 on the nine millimeters,

[00:01:36.07]
380 and 370, these are
all plus or minus five.

[00:01:39.07]
So I take 385 or possibly 375,

[00:01:43.00]
I like them on the plus side.

[00:01:45.00]
360 would be okay, and 350’d be okay.

[00:01:49.08]
And then this is the
critical dimension here.

[00:01:53.01]
So right here, we take the calipers.

[00:01:57.02]
We’re gonna, I like to lock them in

[00:01:58.09]
and do all my mags at once,

[00:02:00.03]
so I lock them in at one inch.

[00:02:03.08]
So just, you got a little lock

[00:02:05.01]
usually on your calipers, set them up,

[00:02:07.00]
I put a dot right above the one inch mark.

[00:02:09.04]
We’re just a tad high but that’s alright.

[00:02:11.09]
So that little dot there,

[00:02:13.06]
at the bottom of that’s gonna be my point,

[00:02:15.06]
I’m gonna measure that
so zero my calipers,

[00:02:18.03]
make sure I’m good.

[00:02:20.09]
None-zero calipers are often a problem,

[00:02:22.08]
so always triple check that
you’re getting good numbers.

[00:02:26.06]
At the bottom, I’m gonna measure this.

[00:02:28.08]
I’ve got five six nine.

[00:02:32.04]
I really want five six
zero in a nine millimeter.

[00:02:36.00]
Same thing on a 40 cal,

[00:02:38.03]
in fact I lost the mark so
we’ll put a new one in here.

[00:02:42.05]
I only have a fat marker so
this might not be the best.

[00:02:45.07]
Thinner markers are better.

[00:02:48.08]
So we’ll bring the calipers down to one.

[00:02:52.09]
And we’re pretty close right here.

[00:02:56.00]
This is going to be
tricky with a fat marker.

[00:02:59.06]
Let me measure what I got there.

[00:03:01.08]
So I’m gonna be just underneath that,

[00:03:03.05]
know that I’m a little high.

[00:03:07.00]
I’m 611, I want 600.

[00:03:09.08]
So, I’m gonna show you
how to squeeze the tubes

[00:03:13.05]
on two tubes that haven’t been done,

[00:03:15.00]
those were done earlier,

[00:03:16.06]
because these tubes are going to be

[00:03:17.07]
a little more in depth,

[00:03:19.00]
so you’ll actually get a good
idea how to squeeze them.

[00:03:21.07]
You want to make your life
simple, do the feed lips first.

[00:03:25.03]
So this isn’t a feed lip tuning video,

[00:03:26.08]
we have lots of those out there.

[00:03:28.02]
This is 350 on a nine
so it’s right in there.

[00:03:32.07]
This is 378 which is just a tad under,

[00:03:35.08]
so somebody might’ve tuned those for me.

[00:03:38.05]
(chuckles)

[00:03:39.03]
Which is good, that speeds us up,

[00:03:41.01]
but use the mag pliers,
there’s plenty of videos

[00:03:43.06]
that we’ve got out there
on how to tune the mag.

[00:03:45.04]
So I’m at the plus side
there a little bit.

[00:03:47.03]
When I squeeze this, those will come in

[00:03:49.00]
and then I’ll have to
bring them out and then

[00:03:50.03]
I might have to squeeze this again.

[00:03:51.03]
There’s a little bit
of give and take there.

[00:03:53.00]
And then, more with the
40 cal then the nine,

[00:03:55.02]
when we squeeze the bodies,

[00:03:56.06]
they’re gonna change the
shape up top a little bit

[00:03:58.05]
and they’re not gonna
want to fit in the grips

[00:03:59.08]
and we’ll have to adjust there.

[00:04:01.02]
Potentially.

[00:04:02.01]
We’ll make it, we’ll do
one so that you see that.

[00:04:05.01]
And there’s a couple ways to do that,

[00:04:06.05]
but let’s do the nine millimeter first.

[00:04:09.09]
I’m gonna measure here.

[00:04:14.04]
This is 30 thou, 32 thou high.

[00:04:16.09]
So the simplest thing that
you might have at home

[00:04:20.06]
is just mag pins, magwell pins.

[00:04:23.06]
And you’re gonna wreck them,
so don’t use good ones.

[00:04:26.05]
Put the center spot of the pin pretty much

[00:04:30.04]
in the spot where the mark is at one inch.

[00:04:33.04]
And then I’m gonna pinch
with my vice just below that,

[00:04:35.08]
so you see my vice lips make
contact just below that.

[00:04:38.08]
You’re gonna crank on these pretty good.

[00:04:41.02]
It’s gonna take a bunch to bring those,

[00:04:42.09]
and they’re gonna wanna
spring back a little.

[00:04:45.02]
If you had time, I would do them,

[00:04:47.06]
I think, in a perfect world,

[00:04:48.06]
if I was doing them at home

[00:04:49.05]
and it was my match set or something.

[00:04:53.00]
I would do them,

[00:04:54.03]
let them sit overnight and
check em in the morning,

[00:04:56.02]
they’re probably gonna
give a little bit back.

[00:04:58.03]
If they give five or
eight thou, 10 thou back,

[00:05:00.07]
it’s not the end of the world.

[00:05:02.01]
So, I’m a little, still
a little thick here.

[00:05:05.07]
So we’ll go again.

[00:05:08.00]
Better to go slow and not wreck a mag.

[00:05:11.05]
So, just, again if you’re
doing them at home.

[00:05:15.08]
The first couple you do
are going to be slow,

[00:05:17.05]
you’ll get much better
at it as time goes on.

[00:05:20.05]
That’s just how it works.

[00:05:22.08]
We’re still just a little bit,

[00:05:25.02]
so I’m gonna get after it this time.

[00:05:32.08]
I think the guys here
have a magic turn number,

[00:05:34.07]
that it, what it takes to get those to go

[00:05:36.07]
and I don’t know what that number is.

[00:05:39.02]
And it matters what your
vice is, so I wouldn’t.

[00:05:42.02]
So I’m a little under here,

[00:05:43.03]
but I’ll tell you that
I’m gonna be narrow here.

[00:05:45.03]
Right, that, pinch that way up.

[00:05:46.06]
So I’m just gonna come
back, my mag pliers.

[00:05:53.09]
I’m still way, I mean, I can
see that that’s not good.

[00:06:03.04]
We’re still a little under
here, this should bring it back.

[00:06:07.06]
So I went further there then I wanted to,

[00:06:09.05]
I would avoid that,

[00:06:10.03]
so just go slow if
you’re doing it at home.

[00:06:12.09]
Still need another 10 thou.

[00:06:18.02]
What you do is

[00:06:19.00]
you wanna keep the general
shape of these tubes,

[00:06:20.09]
you don’t want the shape
to get way messed up.

[00:06:27.03]
There we go, that’s gonna be close, yup.

[00:06:28.07]
I love that number, that looks good.

[00:06:31.03]
And then we’ll come back
and measure this number.

[00:06:34.04]
And then the real test,

[00:06:36.06]
we’re still under here so we’re good.

[00:06:39.07]
Drops, that mag’s done, good to go.

[00:06:42.06]
Again, if you had time,
I’d leave it overnight

[00:06:44.03]
and see what happens in the morning.

[00:06:46.05]
So just to recap on nine millimeter,

[00:06:48.08]
that number we want at .560
and then I want the feed lips

[00:06:52.06]
355 minus 10 for the back
and plus or minus five.

[00:06:58.04]
On a 40.

[00:07:01.02]
We got it queued up here.

[00:07:03.09]
I gotta come 50 thou in,

[00:07:05.03]
which was what the last
of what we did was,

[00:07:06.07]
that’s a fair amount.

[00:07:07.08]
That is,

[00:07:12.03]
that is a bunch so this is
gonna misshape this body some

[00:07:15.04]
and you’ll see how we get those
to come back up in the gun.

[00:07:19.01]
I’m close here, 16 thou.

[00:07:23.02]
So now I’m going to be
a little more gentle.

[00:07:27.04]
Again these things spring in over time,

[00:07:29.02]
you’re going to have to
reset them a little bit

[00:07:30.08]
but it’s not the end of the world.

[00:07:40.04]
You can kinda feel them move too,

[00:07:42.01]
so if you feel it move a whole bunch

[00:07:43.09]
it probably did move in.

[00:07:49.02]
Again this process I’m doing,

[00:07:50.05]
of going slow and just working on them,

[00:07:53.06]
much better then squeezing
one and racking one.

[00:07:59.05]
Getting close, 10 thou away.

[00:08:09.05]
Being a little under here would be okay.

[00:08:13.00]
It’s bringing my feed lips in,

[00:08:14.03]
so I’m going to open my feed lips up

[00:08:15.08]
to just over what I need.

[00:08:18.03]
And you’ll see that that
bends here at the top

[00:08:20.01]
more then it does on the tube part

[00:08:21.06]
but it still moves the tube some.

[00:08:23.07]
So I’m at 81, I’m gonna take that

[00:08:25.04]
to a top number of high 80s, low 90s.

[00:08:32.03]
And then I’m gonna squeeze the tube

[00:08:33.07]
the last little bit

[00:08:34.06]
and it should all just come together.

[00:08:39.02]
These don’t want to move
on the last bit here.

[00:08:46.08]
Alright, 93.

[00:08:49.07]
Squeeze that tube,

[00:08:51.07]
squeak that last 10 thou out of the tube

[00:08:53.08]
then we’ll bring that,

[00:08:54.07]
those feed lips will come
in some part of that.

[00:09:02.02]
614, we’re super close.

[00:09:04.07]
I’d take 605, somewhere in that zone.

[00:09:10.01]
I probably wouldn’t go
much bigger than that.

[00:09:16.04]
And then, if you number all your mags,

[00:09:19.01]
I would keep a log of where they’re at

[00:09:20.09]
just so you have an idea.

[00:09:22.06]
That’s helpful over time,

[00:09:23.09]
just to know how much they’re moving.

[00:09:25.09]
Everybody’s mags are
moving around a little bit.

[00:09:28.08]
So 604, I’m okay with that.

[00:09:30.06]
Now this probably isn’t fitting in here.

[00:09:32.07]
So it’s just barely sticky.

[00:09:35.00]
So what happens when you pinch this

[00:09:36.04]
is it rounds out here,

[00:09:38.02]
you can do it in the
vice or with a hammer.

[00:09:40.03]
The guys in the back like
the vice, I like the hammer.

[00:09:46.01]
That drops, we’ll come back and check.

[00:09:49.00]
Now again, this might be a circle,

[00:09:50.05]
you might do a handful of these.

[00:09:53.00]
That’s a tad big.

[00:09:55.02]
That’s a tad big.

[00:09:56.03]
So we’re just gonna come back

[00:09:58.07]
and pinch one more time here.

[00:10:03.08]
What I like about the hammer is,

[00:10:04.07]
you can be a little more specific

[00:10:06.03]
about exactly where you’re hitting.

[00:10:13.08]
Just over, wanna make this one perfect.

[00:10:26.09]
Now we’re back to the 604 number,

[00:10:29.01]
I bet it’s gonna be just,

[00:10:30.07]
oh and its perfect there, we got lucky.

[00:10:32.05]
If I had to hit it with a hammer,

[00:10:33.08]
I just use the delrin side,
just some light tapping.

[00:10:36.08]
It’s super loud, you might want
hearing protection for that.

[00:10:40.00]
Everybody in the shop
hates it when I do that.

[00:10:42.01]
But now we’ve got a mag
that’s pretty much there.

[00:10:45.04]
So you recheck all your dimensions,

[00:10:46.07]
and you kind of work around that

[00:10:47.07]
to get them where you want them.

[00:10:49.00]
But plus or minus five,

[00:10:50.00]
the numbers we’re running are pretty good,

[00:10:51.02]
we’ve been running these for a year.

[00:10:54.02]
And the 600 and the 560
proved out to be pretty true.

[00:10:57.02]
If we get somebody who calls

[00:10:58.04]
and says they’re having a mag problem

[00:10:59.06]
and they measure that

[00:11:00.08]
it’s almost always that the mags

[00:11:02.09]
have grown just a little bit.

[00:11:04.00]
So an easy fix,

[00:11:06.03]
tune them yourself or
retune them yourself.

[00:11:09.00]
This is the new Gen 2 bodies

[00:11:11.01]
which when tuned right work super well

[00:11:13.06]
and they work well with the STI followers

[00:11:15.08]
and our overpowered springs

[00:11:17.06]
or the gram setups

[00:11:21.01]
for extra capacity and no lock back.

[00:11:24.02]
(smooth club music)

[00:11:27.02]