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Old October 23, 2019, 20:27   #1
raubvogel
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I feel I need another headspacing pin

So, months after putting the 17" barrel I got from gunplumber to the receiver for my tribute band Rhodie thingie, I finally sat down to headspace it:

Largest pin I can close on GO: .259
NO GO: open on .256, closed easily on .253

Do I need a .254 or .255 to verify it closes on it? Or should I just say I need a .258 and be done?
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Old October 23, 2019, 21:48   #2
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I'd go .257 and call it perfect.
Because of the geometry of the actual LS vs the pin gauge (some shit that I don't understand but is my experience) often times a LS of the same size of the pin gauge won't let the bolt close on the gauge. I've found if I go .002 smaller on the LS than the pin everything is perfect. You could actually probably go up to .005 smaller than the biggest pin it'll close on and still be FIELD safe in an FAL. But I run mine tight. I've went .001 under the pin and still found the bolt won't close on the gauge but .002 is always perfect and never a close on a NO GO.

ETA: Don't go swapping LSs just to see if they fit. You're wallowing out the hole and FUBARing the receiver.
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Last edited by hkshooter; October 23, 2019 at 21:56.
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Old October 24, 2019, 12:45   #3
raubvogel
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Quote:
Originally Posted by hkshooter View Post
I'd go .257 and call it perfect.
Because of the geometry of the actual LS vs the pin gauge (some shit that I don't understand but is my experience) often times a LS of the same size of the pin gauge won't let the bolt close on the gauge. I've found if I go .002 smaller on the LS than the pin everything is perfect. You could actually probably go up to .005 smaller than the biggest pin it'll close on and still be FIELD safe in an FAL. But I run mine tight. I've went .001 under the pin and still found the bolt won't close on the gauge but .002 is always perfect and never a close on a NO GO.
That sounds fair. I will reach out to gunplumber as he has shoulders on that size.

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Originally Posted by hkshooter View Post
ETA: Don't go swapping LSs just to see if they fit. You're wallowing out the hole and FUBARing the receiver.
Can I at least rotate the should just so it no longer properly aligned and then pound it directly with a hammer to force it in?
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All I'm really asking for here is a knife that will not jam and a unicorn that doesn't need sharpening. Will_Power
It's been my experience that all you really need to harvest a deer is a car. They come right through the windshield just fine. 357ross
That poop is priceless. MFC
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Old October 24, 2019, 12:57   #4
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Can I at least rotate the should just so it no longer properly aligned and then pound it directly with a hammer to force it in?
NO !!

Align it properly, then get out your Slingblade (some folks call it a Kaiser blade) and give it two good whacks
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Old October 24, 2019, 16:38   #5
raubvogel
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What if it likes it and wants more whacks?
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All I'm really asking for here is a knife that will not jam and a unicorn that doesn't need sharpening. Will_Power
It's been my experience that all you really need to harvest a deer is a car. They come right through the windshield just fine. 357ross
That poop is priceless. MFC
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Old October 25, 2019, 16:32   #6
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What if it likes it and wants more whacks?
Send it to me for some very intense intervention
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Old November 02, 2019, 05:49   #7
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So I got the .257 yesterday and put it in the rifle. And then decided to try the NOGO gauge again. With one finger and light touch it does not close but if I increase the pressure just a bit (I do not have exact numbers but about the same that takes for me to pull the trigger in the FAL), I can close it. Time for .258?
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All I'm really asking for here is a knife that will not jam and a unicorn that doesn't need sharpening. Will_Power
It's been my experience that all you really need to harvest a deer is a car. They come right through the windshield just fine. 357ross
That poop is priceless. MFC
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Old November 02, 2019, 07:15   #8
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Largest pin I can close on GO: .259
Then I'd use .259

Now you've learded something though,,,,
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Old November 02, 2019, 08:20   #9
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Quote:
Originally Posted by raubvogel View Post
So I got the .257 yesterday and put it in the rifle. And then decided to try the NOGO gauge again. With one finger and light touch it does not close but if I increase the pressure just a bit (I do not have exact numbers but about the same that takes for me to pull the trigger in the FAL), I can close it. Time for .258?
It's kind of odd that this would happen when you said in your first post there's no close on a .256 pin but it will close on a .257 LS. Was your chamber and gauge perfectly clean when you got started?
I'd be tempted to try a .259 LS like yovinny said and try the Go gauge again. I still feel like something is amiss here as your observations do not seem typical to me, in my own experience.

BTW, if you don't want the .257 and feel my advice is in error, I'll buy the LS from you. Don't want you to be stuck with a part you didn't need based on my advice.
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Old November 02, 2019, 09:34   #10
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BTW, if you don't want the .257 and feel my advice is in error, I'll buy the LS from you. Don't want you to be stuck with a part you didn't need based on my advice.

....and this is the kind of man that makes this place great


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Old November 02, 2019, 09:42   #11
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If you're using a .234 no go gauge then I wouldn't worry about it. You're in the zone for 7.62 nato
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Old November 02, 2019, 10:09   #12
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Quote:
Originally Posted by raubvogel View Post
So I got the .257 yesterday and put it in the rifle. And then decided to try the NOGO gauge again. With one finger and light touch it does not close but if I increase the pressure just a bit (I do not have exact numbers but about the same that takes for me to pull the trigger in the FAL), I can close it. Time for .258?
The head space is fine as is. Now go tackle another problem.
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Old November 02, 2019, 16:08   #13
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Quote:
Originally Posted by raubvogel View Post
So I got the .257 yesterday and put it in the rifle. And then decided to try the NOGO gauge again. With one finger and light touch it does not close but if I increase the pressure just a bit (I do not have exact numbers but about the same that takes for me to pull the trigger in the FAL), I can close it. Time for .258?
Closing on a NOGO gauge is okay. Lets you shoot a bunch of different ammo types.

Closing on a Field gauge is a straight no-go. Time for new LS.


When I build, I go smaller than you are @ .257. If you close a GO gauge on a .259, I'd build with a .259 - but I'm picky about what ammo goes down the hatch. Maybe I'll regret this later when crappy barely-spec ammo is all i've got available. For now, it's been golden.
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Old November 02, 2019, 16:09   #14
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Originally Posted by hkshooter View Post
It's kind of odd that this would happen when you said in your first post there's no close on a .256 pin but it will close on a .257 LS.
^

This.


Quote:
Originally Posted by hkshooter
BTW, if you don't want the .257 and feel my advice is in error, I'll buy the LS from you. Don't want you to be stuck with a part you didn't need based on my advice.
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"How we burned in the prison camps later thinking: what would things have been like if every security operative, when he went out at night to make an arrest, had been uncertain whether he would return alive and had to say good-bye to his family? Or if during periods of mass arrests people had simply not sat there in their lairs, paling with terror at every step on the staircase, but had understood they had nothing to lose and had boldly set up in the downstairs hall an ambush of half a dozen people with axes, ham- mers, pokers, or whatever else was at hand. . . . The Organs [police] would very quickly have suffered a shortage of officers . . . and notwithstanding all of Stalin‘s thirst, the cursed machine would have ground to a halt." - A. Solzhenitsyn, Gulag Archipelago
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