S&W M&P: Getting the grit out

[briang2ad]

Rather than knocking off the sights (mine are tritium) and getting to the plunger for a polish job, has anyone tried simply leaking some flitz into the plunger cavity then pulling the trigger hundreds of times to polish the plunger/cavity, then thoroughly flushing the cavity out? Thanks.

 

[hardluk1]

It all about the profile of the top of the stricker block not the courseness to the sides of the hole the stricker block is in. For most, the set screw come loose easily with no heat or strain needed and the sight taps out easily with supplied tool. Takes all of 5 minutes to change. OR if you have a solid cutter /buffer wheel to round of the block and polish it. I tried to round it off but was still not happy with it. Went to apex. Cheaper than buying the needed 3m buffering cutting wheels.

Don't try the metal polish in the hole. That really ain't the fix or the problem

https://apextactical.com/store/product-info.php?pid20.html

 

[dsm]

Yep...do the Apex striker block.

 

[9mmepiphany]

As hardluk1 posted, your idea isn't going to accomplish what you intend.

While there may be some roughness in the Striker Blocks channel, smoothing that out won't affect the grittiness of the trigger that you are experiencing. That grittiness has to do with the interface between the trigger bar and the dome of the Striker Block...as well as that between 1) the trigger bar and the sear and 2) the sear and the striker

 

[Ankeny]

Rather than spend money on a new striker block, there is a real easy way to shape the dome and polish it smooth as a baby's behind. I stick the striker block on the end of a properly fitting punch, then chuck the punch up in an electric drill. Carefully spin the dome on wet/dry paper to 600 grit, then finish up with 2000 grit polishing tape. Also, polish the back of the trigger bar that contacts the striker block. No more gritty feel during take up. As 9mmepipany pointed out, there are also contact areas between the trigger bar and the sear that need to addressed, as well as between the sear and the striker. If you haven't seen the instructions on doing an M&P trigger job on Dan Burwell's site, it is worth the visit. The entire trigger job is easy to do and yields great results.