I am a little confused on why one would purchase a #501 without saftey vs a #510 with safety. The #501 requires use of factory safety and bolt release. Why would some get the 501 over the 510 and cause more work??? Thanks.
http://www.midwayusa.com/product/56...e+-+(Aftermarket)-_-PriceCompListing-_-563419
http://www.midwayusa.com/product/22...ington-700-40x-with-safety-1-1-2-to-4-lb-blue
http://www.midwayusa.com/product/56...e+-+(Aftermarket)-_-PriceCompListing-_-563419
http://www.midwayusa.com/product/22...ington-700-40x-with-safety-1-1-2-to-4-lb-blue