Mosin Nagant trigger improvements study 8-29-2011_0001.wmv





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Uploaded on Aug 29, 2011

There were 8 variables studied:
a) firing pin spring force
b) cocking piece to sear fit geometry
c) cocking piece to sear friction
d) sear spring force
e) trigger to sear fit geometry
f) trigger to sear friction
g) sear to cocking piece take up

The original sear spring force was much more important than the other variables combined.
Much effort was wasted before that was discovered.

Improving the trigger is tested with 4 triggers, 4 sears, and 5 bolts.
That is 80 set ups tested for trigger pull, ranging from 4 pounds to 12 pounds.
Then improvements are made with 400 grit wet and dry paper.
Up to 5000 grit is tried but no improvements are found.
The answer it that MN trigger pull is dominated by sear spring force pre set.

An orderly process is developed for resetting the sear spring.

Some force should remain to keep the relaxed sear pressing against the bottom of the receiver, for full sear engagement. It need not be the 12 pounds sometimes seen with MN sears, but I would like at least 1 pound of initial sear force, so the safeness of the trigger is not compromised.
If you want to bend the sear so far that does not even touch the receiver and it has limited engagement with the cocking piece, and 1 pound of trigger pull, that is your biz, but I would not hunt with that.


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