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The only way is to replace the whole trigger but it will still have a hair trigger
Try e-gunparts.com
Can be found on the left side of the weapon just above trigger housing.
You might try this link. Copy and paste it. http://www.gun-parts.com/index.html/
This is a stevens model 39A. The stevens 59A, B and C all had the takedown screw in front of the trigger guard.
http://www.forsterproducts.com/Pages/screws_trigger.htm
western field is/was a mossberg company
Cannot find an exact match- but if your trigger guard is black plastic- and especially if it has finger grooves in the tail of the guard- it was probably made by Mossberg. You can order replacement trigger guards from havlinsales.com There are 3 different trigger guards- check the photos to see if they match your rifle.
They were made by Savage for Montgomery Ward, it's a single trigger model of the Savage 311.
Mr. Bean makes western field marked wesern field 410.
The model number of your Wards Western Field.
That gun should be a Mossberg 183K. For parts, try: Numrich gunpartscorp.com Jack First jackfirstgun.com Bob's Gun Shop gun-parts.com