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Old October 9th, 2017, 06:48 PM   #1
clandestine


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Custom Made - M16/Fostech Echo II Auto Sear/Trigger Safety Gauges

I made this set for my Son so he can be sure his M4A1 Sear/M16 Carrier is timed properly.

This also has use for those civilians with Registered M16 Receivers and Drop in Auto Sears. These Gauges will also tell you if your Fostech Echo II Trigger Safety (Safety Sear) is timed properly with the M16 Carrier.

Took me about 4 hours to make them.

Early Gauge
Good Gauge
Late Gauge
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Old October 10th, 2017, 02:07 PM   #2
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Nice! I only wish I had a dias to test with...


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Old October 10th, 2017, 02:09 PM   #3
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Saw these on IG, very cool!


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Old October 10th, 2017, 08:17 PM   #4
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Thanks gentlemen.
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Old October 10th, 2017, 08:46 PM   #5
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Quote:
Originally Posted by clandestine View Post
I made this set for my Son so he can be sure his M4A1 Sear/M16 Carrier is timed properly.

This also has use for those civilians with Registered M16 Receivers and Drop in Auto Sears. These Gauges will also tell you if your Fostech Echo II Trigger Safety (Safety Sear) is timed properly with the M16 Carrier.

Took me about 4 hours to make them.

Early Gauge
Good Gauge
Late Gauge
Looks like a project for my cnc
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Old October 10th, 2017, 09:03 PM   #6
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Originally Posted by hit3961 View Post
Looks like a project for my cnc
Im sure the CNC would throw them out fast. Took a long time on the manual lathe.

Im still plannning on perfecting the design. Im going to add an O-Ring to keep the Gauge in the Carrier and I need to make a Dummy Firing Pin to use the Gauge properly.
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Old October 10th, 2017, 09:22 PM   #7
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Im sure the CNC would throw them out fast. Took a long time on the manual lathe.

Im still plannning on perfecting the design. Im going to add an O-Ring to keep the Gauge in the Carrier and I need to make a Dummy Firing Pin to use the Gauge properly.
There all the same dimensions Other then the back end? So if you mass produced the early gauge you would just need to take a couple thousand
Of for the rest?
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Old October 10th, 2017, 09:29 PM   #8
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Originally Posted by hit3961 View Post
There all the same dimensions Other then the back end? So if you mass produced the early gauge you would just need to take a couple thousand
Of for the rest?
The main bodies all have the same length and diameter. The face thickness has the variances.

The thickness of the faces are as follows:

.080
.100
.120
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Old October 10th, 2017, 09:43 PM   #9
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The main bodies all have the same length and diameter. The face thickness has the variances.

The thickness of the faces are as follows:

.080
.100
.120
Thanks sure beats the feeler gauge method.
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Old October 11th, 2017, 09:16 AM   #10
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Couldn't these be made as rings to be dropped down over the assembled bolt? (or a C-clip shape) Just point the muzzle up to use on an assembled bolt. Would take no modification to the firearm to test.


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Old October 11th, 2017, 09:24 AM   #11
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Quote:
Originally Posted by smdub View Post
Couldn't these be made as rings to be dropped down over the assembled bolt? (or a C-clip shape) Just point the muzzle up to use on an assembled bolt. Would take no modification to the firearm to test.
A standard ring with an opening large enough to clear the bolt Lug's would have too much play to be accurate in my opinion.


Now if you were to make a coin style gauge that had the bolt lug Cuts made into it, that would work.
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Old October 11th, 2017, 09:32 AM   #12
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Couldn't these be made as rings to be dropped down over the assembled bolt? (or a C-clip shape) Just point the muzzle up to use on an assembled bolt. Would take no modification to the firearm to test.
I don't know where chad came up with this design but it 1000 times more user friendly then the armys feeler gauge method or trying to us a 50cal head space gauge.
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Old October 11th, 2017, 09:37 AM   #13
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I don't know where chad came up with this design but it 1000 times more user friendly then the armys feeler gauge method or trying to us a 50cal head space gauge.
It's something I thought up helping a friend get his M16 in time. You are 100% correct, using a feeler gauge or a pin gauge is a pain in the rear.

This set is actually going in my son's M4 Armorers Kit and it may deploy with him.

I will be making a second set to keep for myself.

I do prefer this design over one that retains the bolt head in place because it ensures that the weapon cannot be fired when you are messing with the gauge.
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Old October 11th, 2017, 10:03 AM   #14
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Can you explain how this is used/works? I'm not familiar with it.
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Old October 11th, 2017, 10:25 AM   #15
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Talking

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Originally Posted by d33rhunt3r View Post
Can you explain how this is used/works? I'm not familiar with it.

https://www.scribd.com/mobile/document/16363465/Timing-an-M16#
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Old October 11th, 2017, 04:06 PM   #16
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Quote:
Originally Posted by clandestine View Post
A standard ring with an opening large enough to clear the bolt Lug's would have too much play to be accurate in my opinion.
Doesn't need to clear the lugs. Only the bolt neck if C shaped. Fancy version could even use a detent spring to hold it on.


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Old October 11th, 2017, 05:16 PM   #17
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Doesn't need to clear the lugs. Only the bolt neck if C shaped. Fancy version could even use a detent spring to hold it on.
Why over complicated a design that he freely shared with everyone. Try using a feeler gauge!!
His simple designs would take 2 minutes to check timing..
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Old October 12th, 2017, 06:37 AM   #18
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Originally Posted by hit3961 View Post
His simple designs would take 2 minutes to check timing..
The simpler design would take 10s to check timing. How is a flat disc w/ a slot cut in it more complicated?


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Old October 12th, 2017, 08:37 AM   #19
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The simpler design would take 10s to check timing. How is a flat disc w/ a slot cut in it more complicated?
Do you have a working prototype? To compare
It to.
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