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Mini 14, Gas Pipe Piston

This is a discussion on Mini 14, Gas Pipe Piston within the Ruger Semi-Auto forums, part of the Rifle & Shotgun Forum category; Hello All, I just was given a Mini 14 from a family member. As I was attempting to fire it recently, it wouldn't slide closed ...


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Old November 20th, 2019, 05:34 PM   #1
 
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Mini 14, Gas Pipe Piston

Hello All,

I just was given a Mini 14 from a family member.
As I was attempting to fire it recently, it wouldn't slide closed to completely chamber a round. When I disassembled it, I noticed that the Gas Pipe Piston was out of place and it easily is installed and removed. I've watched several videos on disassembling it, but no one even mentions the Gas Pipe Piston. Should it be removable so easy? If not, how do I get it to stay in it's position with the ports lined up?

Thanks in advance for the help



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Old November 21st, 2019, 08:52 AM   #2
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jeff, not sure of your question. The two main components of the Mini's gas system are the gas pipe and the op-rod (that big hunk of steel that slides back and forth). I'm guessing the op-rod is what you are referring to as the gas pipe piston.

There is a component of the stock that keeps the op-rod aligned. It is removable and it is quite possible that your Mini arrived on your doorstep without one, which might cause the op-rod's forward cycling from properly connecting with the gas pipe and - hence - locking the bolt.

If that is the case, it is an easy fix. https://www.gunpartscorp.com/products/291530D

Hope this helps. Keep us posted.

And Welcome to the forum from Central Virginia!
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Old November 21st, 2019, 11:48 AM   #3
 
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Re, Mini 14

Thanks so much for the reply.

This is what is/has come out and I'm thinking it shouldn't.

Mini 14.jpg:
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Old November 21st, 2019, 12:17 PM   #4
 
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The gas pipe is a removable part from the lower gas block. It's held in place by the gas bushing that connects it to the barrel to provide the gas path to operate the action when the round is fired. If the gas bushing is not installed or installed incorrectly, the gas pipe will not be locked into place and can slide out of the lower gas block easily.

Remove the 4 screws holding the gas block cover and then remove the gas block lower from the barrel. Inspect for the gas bushing which should be sticking out of the middle of the gas block lower. If it's there, inspect it to see if it was installed incorrectly so that it didn't lock in the gas tube. It could be damaged from improper installation. If it's missing, a set of 3 with different sized apertures is available for $25 from various sources or you can get the stock bushing from Ruger and/or Numerichs.
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Old November 21st, 2019, 03:35 PM   #5
 
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Mini 14

Steve

I will check it out

Really appreciate the help
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Old November 21st, 2019, 05:15 PM   #6
 
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I get the feeling you are talking about the O-Rod and it has fallen out of the track. The track is at the right side of the receiver. You have to get it back into place by putting the appropriate tab into the appropriate notch and it goes back in. It works best if you take it out of the stock to do this.

kwg
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Old November 21st, 2019, 06:16 PM   #7
 
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Jeff, Co Steve explained it well. That gas pipe should not come out on it's own, but when held in by the gas bushing, they do have a little wiggle side to side and up and down.
This helps the op rod close over it, if it were rigid, the op-rod would have a hard time.

If your gas pipe pulls out, you are either missing the bushing, or the bushing is too short, thereby not doing it's job securing the gas pipe.
When you have the gas block separated into the two halves, to reassemble:
put the gas pipe into the lower gas block, and turn it so the bushing will nestle down into the recess in the pipe and hold it in.
Then put the lower block assembly up against the barrel so the top half of the gas block goes into the recess in the barrel.
You can see that barrel recess in this pic, and laying on the barrel, a .100" bushing from a Mini-30.

Then holding the lower block up against the barrel so it stays, put the top half of the block on and start the 4 gas block screws.
Tighten them to 30 inch pounds in a criss cross pattern, ensuring that the gaps are the same on each side, and the same front to back.

If you don't have a torque driver, get the screws snug, then turn an extra 1/8 turn.
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Old November 21st, 2019, 06:36 PM   #8
 
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good luck.
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Old November 28th, 2019, 04:26 PM   #9
 
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Awesome

I really appreciate the help with this.

I'll order it and get that thing firing again.

Have a wonderful Thanksgiving.

Jeff
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