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Legacy Member
Needing helpwith Sten MKV Semiauto build
I just finished putting together a semi Sten MKVad am needing help getting it up and going. Anyone here with experience to share?
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Warning: This is a relatively older thread This discussion is older than 360 days. Some information contained in it may no longer be current. |
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12-05-2021 07:38 PM
# ADS
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Advisory Panel
What operating system are you using?
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Legacy Member
I'm using the kit from Indianapolis Ord.
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Legacy Member
The bolt has two springs and it has an AR firing pin.
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Advisory Panel
The springs have to be balanced.
Both springs resist the recoil of the bolt assembly.
The bolt return spring must be strong enough to reliably close the bolt. It does this alone, because the striker spring is compressed, the striker being held cocked by the sear.
The striker spring must be strong enough to guarantee ignition.
You may find the cocking the action is difficult because the combined weight of the springs is excessive.
Make sure that the moving parts cycle freely and smoothly.
Ultimately, you are going to have to tune the springs by slightly shortening one or the other or both until you have obtained reliable functioning.
Trial and error.
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Legacy Member
thank you, I have ordered another set of springs as I didnt hit the sweet spot with these.
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Advisory Panel
The IO system does have a good reputation, so it is just a matter of finding the correct balance.
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Legacy Member
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Advisory Panel
Does it reliably feed dummy rounds when manually cycled? If it doesn't feed, dry fire, eject and recock when manually cycled, you aren't ready for live fire.
You can test ignition by chambering a primed case, and seeing if primers are reliably popped.
If it does, you are ready to move onto test firing.
Load one round. Does it fire, eject and recock?
If it doesn't, there may be too much resistance.
If it does eject and recock, does it close completely, successfully feeding a new round? If feeding isn't reliable, could be the recoil spring, could be magazine related, could be the geometry of your construction.
If it misfires, if there are light primer strikes, the striker spring may not have enough oomph.
If it functions with a single round, try two, try three.
It is a matter of experimentation.
You are just going to have to experiment.
Ammunition can be a factor as well.
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Legacy Member
thanks for all the info. Will regular blank rounds work for setup?
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