Looking for a replacement M&P10 firing pin.
Is this a proprietary S&W part or will any "LR308" firing pin work?

Earl, I believe that S&W uses a firing pin spring in order to prevent a "slam fire" when the bolt slams into battery.. I don't believe DPMS uses a firing pin spring in their 308 AR, and I'm not sure about ArmaLite's AR-10... that spring is there as overkill, all 308 AR pattern rifles will leave a slight dimple on the primer as the bolt is released, whether using the slingshot method or the bolt release. Doesn't hurt anything, and has never been a problem in a well maintained fire arm with compatible parts...

I would remind all, that Smith and Wesson produces the M&P 10,, it is not a DPMS pattern rifle, nor is it an AR-10 which is proprietary to ArmaLite, so it is technically not an LR308 which would be Rock River, but generically would be referred to as a 308 AR..

Does your firing pin have visible damage?? or is your weapon suffering from reliability issues?? I would return it to S&W in either case, in order not to void the warranty...

hope this helps, Billy

I would add that while you might request a firing pin from S&W,, I rather doubt they will send you one, but it won't hurt to ask,,, I would add that prior to contacting S&W, I would return the rifle to factory configuration in order not to void your warranty.. they are very particular about AR's in general, and the M&P 10 in particular.

feel free to PM me if you prefer not to answer these questions on the forum... in my experience S&W has built a very fine rifle,, but there are some parts that are proprietary,, they really prefer we don't go messing with their rifle honestly..

the main reason I bought a WC-10,, LOL

5.56 NATO spec rounds use a harder primer to prevent slamfires from the AR floating firing pin. I suspect 7.62x51 NATO rounds might as well, even though there isn't a military "AR-10", nor do I think are SR-25s being used to any great extent in NATO military forces.

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NRA RSO

My plan was simply to obtain backup parts of wear items. In the same pass I wanted to know which of these parts were proprietary where I would be required to get the S&W part.
The rifle works perfectly fine and looks nothing like its original configuration.
Thanks BillyMagg

The design basis primer for 7.62 x 51 mm is the CCI 34.