Tuning Daystate Pulsar o-ring question

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ronmcc4

ronmcc4

Member
Mar 13, 2020
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Jackson, Tennessee, United States
I removed the shroud from my Pulsar tonight with the idea to remove the barrel for easier cleaning. As it turns out, I'm not sure that is any easier with a Pulsar.

At any rate - when I removed the shroud, there was a damaged o-ring that fell out as the shroud was coming off. I apparently damaged this o-ring taking the shroud off. I believe this is the o-ring in the Daystate exploded diagram as #33 that apparently goes in front of or on #32 Bush.

I have a pack of Pulsar o-rings from Bagnall and Kirkwood but there wasn't an o-ring in there that seemed to fit properly either in front of #32 Bush or in the groove in the #32 Bush. The closest fit in the pack was too big to fit in the groove in the #32 Bush part and it also wouldn't stay put in front of the #32 Bush part. It's difficult to tell from the Daystate diagram where this o-riing actually goes: in the groove on the bushing or in front of the bushing. All other o-rings associated with the shroud/barrel assembly were in place and undamaged.

I reassembled the gun without that o-ring and tested it in my short indoor range (10 yards - it was after dark - so I used my basement range). Everything seems to work fine and I can tell no difference with this o-ring not installed.

So - what is the purpose of o-ring #33? Is it OK to continue without it? And - if I need it - can I purchase these at AoA? If I knew the size I could get it at theoringstore.com. But - I'm not really sure what it does or where it goes.
 
Start at 8:50-

https://youtu.be/qCZMbUvqFMk

Use some Shoe Goo to keep it in place if it's too loose and to keep it from coming off so easily. Dont need a genuine Daystate o-ring match another from ACE Hardware is fine. Shoe Goo it in place then use divers grease when dried then reinstall shroud and the spring and baffles and endcap.
 
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Thanks - That was a fascinating video; wish I could have understood what he was saying. I also found some other videos and pictures that unintentionally showed that part and the o-ring as well but none as good as this one.

I usually DO use a pull through but was a bit curios as well. I later discovered you don't even have to take the shroud off to remove the barrel per an AoA video about changing the barrel o-rings. I'm kinda glad I did though - all that is no longer a mystery.
 
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Got it fixed. We have an industrial supply store called HCI here. They are my go-to for fasteners, o-rings, etc. I carried the broken o-ring and my measurements to them and got fixed up with 6 o-rings (a couple of sizes in case what I though would work didn't) for the grand total of $1.29. FWIW the inside diameter of the o-ring that is #33 in the Daystate diagram is 17mm. That's the one that goes on the shroud bushing.
 
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Ok, so what’s the O.D. On that ring?

Thanks
Click to expand...

Normally, when order or buying o-rings you need the cross section and inside diameter. The one I used as a replacement was a metric o-ring 1.78mm x 17.17mm. I didn’t measure the outside diameter but using those figures it should be 20.57mm.

I’m sure it was a common Buna-N o-ring. The job of this o-ring is to buffer contact between the shroud bushing and the shroud. It keeps the shroud centered around the barrel out near the end. 
 
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