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RotaryJihad
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Posted: 8/6/2012 10:03:47 PM

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I have an SAA lower, the rear detent spring hole appears to be threaded. Does anyone know what the thread pitch is?

Also, should I do something to chase/lube the threads before running a set screw down there?
iNeXile556
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Posted: 8/6/2012 10:11:56 PM
[Last Edit: 8/6/2012 10:16:35 PM by iNeXile556]
4-40, use a 4-40 x 1/8" set screw, a very small bit of grease or anti-seize never hurts.

If the pin is too tight when you assemble it, take the spring out and clip a turn or two off and try again. Repeat as needed.
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Kilroytheknifesnob
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Posted: 8/6/2012 10:17:03 PM
[Last Edit: 8/6/2012 10:17:41 PM by Kilroytheknifesnob]
4-40x1/8" I think. Remember to cut off an appropriate length of spring to compensate for the set screw. I'd definitely throw some anti-seize on the threads before screwing it in.

Edit: Dammit, too slow.
Direct-Drive
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Posted: 8/6/2012 10:30:36 PM
[Last Edit: 8/6/2012 10:32:15 PM by Direct-Drive]
The above posted size is correct.
I did not have to cut my spring.
Lightly grease the detent tip and grease the detent channel in the pin with your moly-fortified barrel nut grease.

You will need a .050" Allen key for that size set screw.
mrrick
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Posted: 8/7/2012 12:52:43 AM
Originally Posted By iNeXile556:
4-40, use a 4-40 x 1/8" set screw, a very small bit of grease or anti-seize never hurts.

If the pin is too tight when you assemble it, take the spring out and clip a turn or two off and try again. Repeat as needed.


this is what I do to all my lowers