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RPD Won’t cycle
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  Paraquat

1LT
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Joined: March 14 2013
Posts: 952
Posted: October 09 2018 at 6:51am | IP Logged Quote Paraquat

In a panic I assembled my RPD kit to beat the April 2014 deadline that would have restricted such a beautiful firearm in my state.

I did all the entire semi conversion with parts purchased from Project Guns on a PG semi receiver, brought it to the range, fired a few test rounds.
I haven't touched it since.

The problem was it didn't cycle. (What, specifically, I do not recall)
I couldn't tell you if it was a failure to feed. Failure to eject. Failure to return to battery.
I remember I had to charge the handle each time.
Again, this isn't helpful because: why?

I'm going to use this thread to document everything because I have this nasty habit of revisiting a problem from 4 years ago and not remembering anything.

I know they are over gassed. I measured the gas block and ended up with ~.185 diameter gas hole. The sketch I have shows a .171"

I know I measured from the seating face of my gas block to the center line of the gas hole, then put an edge finder on the shoulder of the barrel and moved in that amount exactly.

I do not have visual confirmation because my gas adjuster is frozen.

Last night I picked it up and took it all apart.

First thing I did was pop out the pins and press front sight post, bipod, and gas block off.
I had drilled the gas port .1875"

My gas adjuster was still frozen so I left it soaking in oil overnight.

End scene.
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  Paraquat

1LT
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Joined: March 14 2013
Posts: 952
Posted: October 10 2018 at 6:23am | IP Logged Quote Paraquat



After soaking the gas adjuster in oil I was able to loosen the screw.

If that's supposed to be a spring loaded plunger on the side, it's frozen.
I also can't get this gas adjusting cylinder to move. There isn't a parallel surface on this thing. I tried clamping it in my bench vise perpendicular to the barrel, heating it with a torch, dropping a socket into the gas block on top of the adjuster, and giving it a little tap with a hammer but that didn't free it.

I'm open to suggestions there.
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  tr6guns

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Posted: October 10 2018 at 8:49am | IP Logged Quote tr6guns

This is the only spring that I know of..
https://mg34.com/product/rpd-spring-washer-for-gas-regulator /
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  ryche

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Posted: October 10 2018 at 9:39am | IP Logged Quote ryche

there is no spring loaded plunger.
The pin is a locking pin for the adjuster, it should run fine at number 2 setting.
those adjusters are very tight and usually have to be bashed out.
loosen the screw a couple of turns then i use a rubber sand hammer
to bash on the screw head untill the whole thing breaks free.
Ryche
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  Paraquat

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Joined: March 14 2013
Posts: 952
Posted: October 17 2018 at 9:32am | IP Logged Quote Paraquat

Great success.
I found enough equipment in my bearing press kit to rig something together.

Essentially, I installed the bolt and rested the rest of the gas block on a plate. I put a doughnut over the rest of the gas block and pressed down. The bolt acted as a physical stop as I forced the gas block down. It was a loud pop but it finally released.

I also found my original demilled barrel. The gas port hole is huge. I think that's where I got my .185 dimension but I haven't measured it yet.
Savages drilled 3 holes through and they penetrated the rifling in the opposite side.

My gas block was stamped "2" on the bottom. I don't know if they set the rifle and then stamp it at the factory or if it's some kind of ID mark.
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  Paraquat

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Joined: March 14 2013
Posts: 952
Posted: October 18 2018 at 11:05am | IP Logged Quote Paraquat

I measured the gas hole in my demilled barrel. It measured .180"
I believe this to be 4.5mm with a little wiggle or gage error.

I measured the hole I drilled in my barrel. It is .187". This sounds right to me because I would have used a .1875 drill knowing the rest of the gas block would cover the opening.

All other ports in the gas block measure .180"

Next step will be to press the gas block onto the barrel. With the regulator removed I can visually verify my gas orifice is not blocked or restricted in any way.
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