A shorter spacer or a shortened spring (due to wear) prevents the bolt from sitting back as far when at rest. When you pull the trigger, the downward movement of the sear could cause the bolt to be forced back just a bit. With the bolt sitting farther forward it required more trigger pull force to be exerted on the sear to move the bolt back while the sear moved down the edge of the bolt. Putting a longer spacer or a fresh powertube spring pushed the powertube oring farther back into the powertube and basically preloaded the force required to compress that oring so that it took that much less force to move the sear down the face of the bolt.
The result was a lighter more crisp trigger feel when using a longer powertube spacer or a fresh powertube spring.
The result was a lighter more crisp trigger feel when using a longer powertube spacer or a fresh powertube spring.
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