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USGI parts interchange


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#1 youngblood1989

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Posted 26 January 2018 - 08:11 PM

Does anyone know what usgi parts will interchange with an Oow A3?
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#2 emmagee1917

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Posted 29 January 2018 - 03:26 PM

Basically everything except the trigger group itself and even then the housing and safety can be  machined to fit . The bolt itself will interchange but the rear block holding the secondary firing pin would have to be moved over to the new bolt group and the new firing pin fitted to the gun .

Chris


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#3 emmagee1917

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Posted 29 January 2018 - 03:37 PM

Oh , yeah , the slide is modified and I believe the block that slips into it is , too . The gas regulators interchange , but the holes in the gas regulator have to be opened up ( drilled out bigger ) to give more gas so as to have the power to cock the hammer .

Chris


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#4 youngblood1989

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Posted 29 January 2018 - 06:39 PM

Awesome, Im wanting to get some spare parts but didnt want to have to spend OOWs prices. What about the ejector, seeing how thats part of the trigger group? And will a usgi extractor fit on oow bolt? Thank you.
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#5 OCM

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Posted 29 January 2018 - 06:54 PM

CJL was talking/advising to me about my Monitor build, the GI gas regulators have to be drilled out .  The NES ones fit nicely in a OOW gas tube cylinder, some don't. The early OOW 18s had a combination of all sorts of things, all original BAR parts tho. Winchester, NES etc. Have not checked the NES slide to see if it was modified.  Monitor of course will be , IF, I ever get the BAR kit from them. Should of started this project 20 years ago. 

 

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Edited by OCM, 29 January 2018 - 06:58 PM.

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#6 jl7422

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Posted 29 January 2018 - 06:57 PM

Ejector yes. . . I don't know about extractor but I believe it will as well.


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#7 emmagee1917

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Posted 30 January 2018 - 01:52 PM

Yes to both .

Chris


Edited by emmagee1917, 30 January 2018 - 01:52 PM.

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#8 AlexanderA

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Posted 21 February 2018 - 09:31 AM

"the GI gas regulators have to be drilled out."

 

Wouldn't the largest hole in the GI regulator be about equivalent to the middle or smallest hole in the OOW regulator? In other words, wouldn't the gun work -- if it was clean, before fouling buildup -- with an unmodified GI regulator on the largest setting?


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#9 emmagee1917

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Posted 21 February 2018 - 12:50 PM

Close .

GI spec 0.055 / 0.063 / 0.0725

OOW spec 0.076 / 0.0885 / 0.093

 

Now , before you get all excited about drilling big holes , consider .

You are not going to be fighting off the hordes through the mud and gunk for days on end firing thousands of rounds without cleaning .

A nice tight new build will use a bit more gas than one broken in even if both are well lubed .

A3s usually will function new with M2 ball spec ammo in the middle setting .

When broken in , they may function on small setting .

You may want to shoot 180 grain moose loads sometime ( maybe all that's available ).

You can always redrill bigger , kinda hard to redrill smaller .

I'd start with 0.063 - ish / 0.076 / 0.0885 and go from there .

 

Chris


Edited by emmagee1917, 21 February 2018 - 12:51 PM.

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