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Old 02-11-2014, 05:01 AM   #1
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New SA Mil-Spec Machining

Just bought a NIB SA Mil-Spec. I discovered upon trying to install an extended mag release that the bore in the receiver is not even close to the blueprint in diameter. Hole is supposed to be .313", and mag release diameter .312". Hole in receiver is .302", and original mag release is .287". New extended mag release is .312" which obviously issn't going to fit the hole in the receiver. The original mag release is obviously been modified in diameter, as the finish has been removed on most of the length. The end where the mag catch goes still has its finish untouched. I have 2 options, it seems. Ream the hole in the receiver, or reduce the diameter of the mag release. The mag release fits in except for the last 1/8" or so. This is where I am measuring with my calipers. So- any recomendations? A correct size reamer is out of the question, pricewise. A drill would try to grab the side of the hole. I suspect a round file is going to be the logical choice, as if I ever wanted to put a different mag release in, I don't want to have to reduce it's diameter to fit the receiver. Why such crappy machine work from SA?
 
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Old 02-12-2014, 02:09 PM   #2
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Quote:
Originally Posted by Davidlee_64 View Post
Why such crappy machine work from SA?
Because you got what you paid for. Don't get mad at me for that..it is what it is.

Secondly, I commend you for looking up the correct size on the prints.

Third, make sure the caliper is accurate...those are notoriously inaccurate.

If it were mine, I'd invest in a cheap reamer...yea, there is such a thing if you shop around.

Next option is to reduce the extended mag catch to size. Only need emery cloth and some time to do that.

Last edited by Scottly; 02-12-2014 at 02:12 PM.
 
Old 02-13-2014, 01:34 AM   #3
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Thx for the response. No, there is no reason to get mad at you for item 1. But, I admit, I was under the impression SA was of a decent quality.
Item 2- I work in fabrication, and the drawings are always the first step.
Item 3- I will check the caliper against a real micrometer.
Item 4- I will have to shop further for a correctly sized reamer. My personal preference would be to "modify" the receiver to the correct dimension.
 
 
Old 02-13-2014, 06:36 PM   #4
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I'm sure they switched it to .302 because of the commonality of the "N" wire guage drill bit.

Here's a cheap chucking reamer...No, it's not the best, but good enough for what you are dealing with.


Reamer - HSS .313" Chucking Reamer - Straight Shank, Straight Flute: Amazon.com: Industrial & Scientific
 
Old 02-13-2014, 06:39 PM   #5
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Quote:
Originally Posted by Davidlee_64 View Post
I was under the impression SA was of a decent quality.
.
They are, but sometimes price dictates a different path (see my drill bit comment). I think, overall, you are way ahead with that gun as opposed to the RIA's and the like...not only are the holes incorrct size, but incorrectly placed on some of that junk.

And remember...if they say it's "drop in", they lied to you. :-)
 
Old 02-13-2014, 08:32 PM   #6
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Some fitting required

Could this simply be a case of a slightly oversize part?ive found S&A parts to be high quality. Most high end parts such as Wilson are slightly oversize. Better slightly oversize than slightly sloppy. Just sayin
 
Old 02-14-2014, 06:15 AM   #7
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I have been doing some research on different source drawings. What appears to be original manufacturer drawings, indicate all dimensions as + or - .010", on the receiver drawing. Another source shows a tolerance of +.003" or -.000". My SA receiver is .302", which suggests they went by the original drawing, so I would theoretically have no complaint. Instead of "N" (.302") wire size, a 5/16" (.3125") would be a more logical choice to my way of thinking. The mag release is per the drawing, .312 + .000.
 
Old 02-14-2014, 02:31 PM   #8
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I went ahead and ordered the .313" reamer you linked me to. Thank you. I never thought of Amazon. My preferences have always leaned toward getting things to the correct specs first, then fit as required. After reading some specs for the mag release, the hardening spec would prohibit reducing it's diameter to fit the frame hole as is. That would go thru the depth of the called out hardening, if it is actually hardened as specified. That could cause increased wear, and possible failure to serve it's purpose. No point in asking for more trouble.
I have ordered some Wolff springs to try and reduce pressures required to operate the mag release and reduce the physical force required to operate the slide manually, as I have suffered some hand/arm strength due to diabetes. I will most likely be using 230 gr ball ammo consistently, so will tune for that. But enough for now, Tuning will be the subject for another thread, I suspect.
 
Old 02-14-2014, 02:37 PM   #9
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Points well taken. To be honest, I did look at RIA, as my LGS had some in stock. But- I also considered what I was really looking for, which was close to GI issue, without all the fancy stuff added. Also the forged vs cast frame, and slide did cause me to lean towards the SA. I have been in steel fab for over 45 years, and am quite aware of the qualities of both types of materials. Granted, each has it's place, so I am not judgmental in that respect. But since the SA was more to what I wanted, I went that way, price be damned, lol.
Quote:
Originally Posted by Scottly View Post
I think, overall, you are way ahead with that gun as opposed to the RIA's and the like...not only are the holes incorrct size, but incorrectly placed on some of that junk.

And remember...if they say it's "drop in", they lied to you. :-)
 
Old 02-14-2014, 02:48 PM   #10
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Quote:
Originally Posted by Davidlee_64 View Post
Tuning will be the subject for another thread, I suspect.
Screw it, let's talk about it here... :-)

You can reliably run a 19lb main spring (23lb is stock on most, higher on some SA's) and a 14lb recoil spring (16 lb is stock, some come with 18.5lb) without beating the crap out of your frame, and reliably feeding. Most of the SA's have very stiff firing pin springs to pass the California drop test. Junk that and order a Wolff recoil spring, as it will come with a new firing pin spring. Even though it's called a "high power" spring, it's a better choice than the stock SA spring.

That combination will give you reliable firing and feeding, and be easier for your hands to charge.

If you wish, you can go down to a 17lb main spring, but I would recommend a firing pin that's .030 longer than factory to ensure reliable ignition.
 
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