Weird range experience today with my RRA 9mm

[Azrael2004]

The weak loads are the most likely culprit. I can run WWB aamo all day long and it runs 100%. If I run UMC I get short stroke failures. My solution is not to run UMC.

The bolt stop breakage is really not from the pressure of the round but a result of the bolt travel before it slams into the stop when it is raised.
You can get a buffer that is longer or put spacers ehind the recoil spring.
I used a couple nylon spacers in mine that I found at Lowe's.
Some folks use quarters as a spacer. IIRC it was about $1.75 in quarters. Add more or less as needed.
Just drop them in the empty buffer tube then reinstall the spring and buffer.
Assemble the gun then pull the bolt all the way back. Look in the ejection port and see how far it is from the bolt stop when all the way back.
You want it to be about 1/8" from the stop.
Try it before the spacer and look how far it goes back. This is why they break the stops.

[Alaskapopo]

The weak loads are the most likely culprit. I can run WWB aamo all day long and it runs 100%. If I run UMC I get short stroke failures. My solution is not to run UMC.

The bolt stop breakage is really not from the pressure of the round but a result of the bolt travel before it slams into the stop when it is raised.
You can get a buffer that is longer or put spacers ehind the recoil spring.
I used a couple nylon spacers in mine that I found at Lowe's.
Some folks use quarters as a spacer. IIRC it was about $1.75 in quarters. Add more or less as needed.
Just drop them in the empty buffer tube then reinstall the spring and buffer.
Assemble the gun then pull the bolt all the way back. Look in the ejection port and see how far it is from the bolt stop when all the way back.
You want it to be about 1/8" from the stop.
Try it before the spacer and look how far it goes back. This is why they break the stops.

I have a longer heavier buffer from slash but the gun will not run reliably with it and I have sent it back to Slash to lighten it a bit.
Pat

[Azrael2004]

Longer is good, but it would be nice if they stuck with the standard 9mm buffer weight. They all seem to want to make them heavier.

[redtazdog]

I have a longer heavier buffer from slash but the gun will not run reliably with it and I have sent it back to Slash to lighten it a bit.
Pat

.
I have the same slash buffer and had the same problems until i installed a
wolff reduced power buffer recoil spring and now its a 100% runner.

[Alaskapopo]

.
I have the same slash buffer and had the same problems until i installed a
wolff reduced power buffer recoil spring and now its a 100% runner.

Thanks for the tip. I will order one. SLash also reduced the weight of my buffer for me and I am going to test it on my next RDO's.
Pat

[CarlosDJackal]

What kind of lube were you using? I ask this because if you happen to be using a lube that likes to gel up in lower temps, this may be the culprit. Also, did you have the "Roll of quarters" installed behind your action/buffer spring?

[Alaskapopo]

What kind of lube were you using? I ask this because if you happen to be using a lube that likes to gel up in lower temps, this may be the culprit. Also, did you have the "Roll of quarters" installed behind your action/buffer spring?

Standard buffer and spring at the time of the shoot. I have a Slash longer buffer now. The lube I used was machine gunners lube from Larue.
Pat