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Old September 28, 2012, 03:46 PM   #2
Senior Member
Join Date: March 27, 2006
Posts: 1,481
Can't tell you if the housings are different, but the 510 has a curved trigger and the 517 has a straight trigger. Straight triggers are used more in competition than field use. I've installed quite a few 510s and it's a completely different world compared to the factory trigger. Highly recommend the Timney
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