9mm RO Build

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9mm RO Build

Post by Jon Eulette on Wed Oct 26, 2016 8:06 pm

Living in Kaliforniastan I don't work on lots of RO pistols. I have a 9mm I'm getting ready to build and I saw something I'd never seen before. The frame rails have raised pads. Still have some typical RO vertical and horizontal play.
Has anyone else encountered the pads? I'd show a pic but my phone has been dropped one too many times and takes horrible pics.
Jon

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Re: 9mm RO Build

Post by Dr.Don on Thu Oct 27, 2016 7:43 am

Pads?  Where are they Jon? Top, sides?  Are they frequent/periodic so the slide rails ride on top without hitting the ends of the pads?

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Re: 9mm RO Build

Post by Jon Eulette on Thu Oct 27, 2016 7:55 am

Don,
They are on top primarily and barely extend out to sides of rails. There are 4; two front and two rear on each side. I'd send a pic but phone sucks Sad
Jon

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Re: 9mm RO Build

Post by Wobbley on Thu Oct 27, 2016 8:26 am

Sounds like they're "sacrificial" fitting pads to allow a tight fit slide to frame at lock up.  The pads would be fitted to the slide groove.  These would allow a tight lockup and not impair functioning.

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Re: 9mm RO Build

Post by Jon Eulette on Thu Oct 27, 2016 8:36 am

I wouldn't call them 'sacrificial'. They would offer less friction if slide was fully bearing on them, bit its not. Frame to slide fit is no better than typical 45 RO. Not much difference between lockup (in battery) or full recoil. By the way, any looseness in full recoil is typically because of gunsmith intentional fit not factory.

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Re: 9mm RO Build

Post by Dr.Don on Thu Oct 27, 2016 10:05 am

Interesting.  Cannot imagine why they did this.  I guess in theory if slide was fully bearing on the pads in lockup, one would only need to fit the pads to make a slide fit.  But I would think the pads might wear faster than full rail fitting.

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Re: 9mm RO Build

Post by Jon Eulette on Thu Oct 27, 2016 10:32 am

When some  top pistolsmiths build pistols on already built pistols they weld up only a portion of the rails similar to this. So maybe SA is copying them?
Jon

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Re: 9mm RO Build

Post by igolfat8 on Fri Oct 28, 2016 6:49 pm

Hmm, would that RO belong to someone that we both know?

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Re: 9mm RO Build

Post by Jon Eulette on Fri Oct 28, 2016 9:41 pm

I have a pair of them! They are both different but the same Smile Rails are different....both getting exact same comp but 1 is Kart and the other KKM. I need to compare serial numbers to see how close their birthdays are?

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