The manual calls part B-42 a bolt lock spring.
You can go to any of the websites that sell gun parts and narrow down what you are looking for by make model and part.
Here it is at Midway:
http://www.midwayusa.com/product/718604/ruger-bolt-lock-spring-ruger-10-22-10-22-magnum
Here it is at Brownells:
http://www.brownells.com/rifle-part...__10zz1zz22&avs|Manufacturer_1=RUGER&psize=96
I am sure there are several more websites you can search. Including the Ruger website. You can even call Ruger and they might send you one for free.
http://shopruger.com/10_22-Bolt-Lock-Spring/productinfo/60016/
You can go to any of the websites that sell gun parts and narrow down what you are looking for by make model and part.
Here it is at Midway:
http://www.midwayusa.com/product/718604/ruger-bolt-lock-spring-ruger-10-22-10-22-magnum
Here it is at Brownells:
http://www.brownells.com/rifle-part...__10zz1zz22&avs|Manufacturer_1=RUGER&psize=96
I am sure there are several more websites you can search. Including the Ruger website. You can even call Ruger and they might send you one for free.
http://shopruger.com/10_22-Bolt-Lock-Spring/productinfo/60016/
