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Howa gas piston nut |
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BruceGFL
Recruit Joined: Jun 12 2016 Location: Tampa, Fl Status: Offline Points: 20 |
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Posted: Sep 22 2019 at 1:01pm |
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Hello All,
I'm going back to a show today for another look at a Saginaw S'G'. The serial number and Underwood 12 - 43 barrel seem to fall into the correct time frame. Most of it seems GI, except that the gas piston nut is of the Howa design, two lugs. Has anyone seen this or might you have an idea? Did Uncle Sam use these during refurb? I have searched my limited library but no joy there. Many Thanks |
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New2brass
Moderator Group Dan Pinto, Photo Editor Joined: Nov 29 2015 Location: CT Status: Offline Points: 4627 |
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I would think any parts made under US contract would be to US specifications.
There are Howa rear sights that are US spec. The ones on the commercial and for the Thailand Police are different.
It is highly unlikely that nut would be part of a US ordnance refurbish or rebuild. this would require a different tool, training and at least a technical bulletin. |
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BruceGFL
Recruit Joined: Jun 12 2016 Location: Tampa, Fl Status: Offline Points: 20 |
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Thank You, makes good sense.
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blackfish
On Point Joined: Mar 30 2016 Location: 999-0 Status: Offline Points: 289 |
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Yah, required training using the different tool highly likely. Lefty lucy righty tighty. Seriously, was there no torque spec for this fastener? |
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New2brass
Moderator Group Dan Pinto, Photo Editor Joined: Nov 29 2015 Location: CT Status: Offline Points: 4627 |
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Seems rudimentary, but it requires a special tool. consider who was doing what and their age as well as skill level. Compound that with the number of firearms that you may have to deal with. There were MWO for the magazine catch, very simple for someone with experience. Same with the adjustable rear sights. PS monthly also pointed out not to tighten slings, but to leave slack on the carbine and I believe the garand when storing, as a cotton sling can shrink and cause the stock to bow. Seems rudimentary, but they published it As to the piston nut FM 23-7 from 1952 pages 92 and 93 outline the procedure for removing and cleaning the nut, no torque specs. It states to use the gas piston nut removal tool, M5 tool. With that if the M5 tool had three prongs what would the person doing the maintenance do to remove a nut with two prongs? there would have to be something explaining the new tool and what it was used for. |
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BruceGFL
Recruit Joined: Jun 12 2016 Location: Tampa, Fl Status: Offline Points: 20 |
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Hi All, has anyone ever seen such a tool or knows where one is available please?
Thank You
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floydthecat
Hard Corps Joined: Oct 13 2016 Location: Mississippi Status: Offline Points: 1996 |
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How are the prongs situated? You might have to manufacture a tool from a socket or something. That would not be that difficult to do.
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BruceGFL
Recruit Joined: Jun 12 2016 Location: Tampa, Fl Status: Offline Points: 20 |
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They are 180 degrees apart
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floydthecat
Hard Corps Joined: Oct 13 2016 Location: Mississippi Status: Offline Points: 1996 |
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Piece of cake.
Sounds like you could use a cheap thin-wall socket that will slide over the piston and sit on top of the nut. Mark the socket in the two places where you need the notches and open them up with a grinder, file or however. All you need to do is remove the nut and you can replace it with the GI 3-prong. But, then you will need the wrench for that. Was there any reason you wanted to remove it in the first place?
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BruceGFL
Recruit Joined: Jun 12 2016 Location: Tampa, Fl Status: Offline Points: 20 |
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Only to clean out the gas cylinder as the piston is not freely sliding back and forth like my M1A does. Although the more I read here about the self cleaning aspect maybe I should try other avenues first. Like soaking in Kroil.
Thank you for your socket method!
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floydthecat
Hard Corps Joined: Oct 13 2016 Location: Mississippi Status: Offline Points: 1996 |
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General rule-of-thumb for gas pistons is...if it ain’t broke, don’t fix it. Free it up if at all possible by other means if it’s stuck. If it’s just sluggish, it will still likely work just fine.
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tenOCEE
Hard Corps Knows rear sights! Joined: Jan 01 2016 Location: East Tenn Status: Offline Points: 1330 |
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M1A1.
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