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Hi–fairly new to me is a Winchester 75 (WWII-era trainer, been through two Anniston Arsenal rebuilds). It does not fire a round consistently. While the trigger seems to function fully (it has range of motion, the adjustment screw seems to make a difference), once the bolt is closed the trigger has little-to-no play and it usually won’t fire a round.
Also, if I chamber a round with the safety on, occasionally when I take the safety off a round will fire without me touching the trigger.
It’s clean/lubricated, and the trigger/safety seem to work fine–until the bolt is inserted. From reading older posts, it seems changing the firing pin might be a fix…appreciate any ideas/suggestions.
Thanks in advance!
You are on the right track, the firing pin also has the sear which can get worn. A worn sear is typically what causes the rifle to fire when the safety is released. There is also a safety test called the “bump test” where the bolt is closed (cocked) on an empty chamber or with a snap cap and the butt of the rifle is bumped on a padded floor or with a light blow from a rubber mallet. If it fires it fails the test and the firing pin and/or trigger (or both) should be replaced.
Based on the age of your rifle and number of rebuilds there may be other compounding problems. The good news is the component parts you need are the same as the much more plentiful Model 69 and are readily available.
Best Regards,
WACA Life Member #6284 - Specializing in Pre-64 Winchester .22 Rimfire
JWA said
You are on the right track, the firing pin also has the sear which can get worn. A worn sear is typically what causes the rifle to fire when the safety is released. There is also a safety test called the “bump test” where the bolt is closed (cocked) on an empty chamber or with a snap cap and the butt of the rifle is bumped on a padded floor or with a light blow from a rubber mallet. If it fires it fails the test and the firing pin and/or trigger (or both) should be replaced.Based on the age of your rifle and number of rebuilds there may be other compounding problems. The good news is the component parts you need are the same as the much more plentiful Model 69 and are readily available.
Best Regards,
Thank you, appreciate the feedback!
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