I know that you said that you don't want to find the old locks, but this is how I solved the problem in my Longshot. I found that keeping the trigger lock piece installed and even using a more powerful spring for it does a great job of keeping the bolt sled forward, since it engages the back of the sled with a 45 degree slant. I cut the "hook" part of the trigger piece off to prevent the trigger itself from being locked. Before this, every time I ran with a Longshot, the bolt would come open. After, I have never once had the bolt open on its own.
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