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In my quest to find out what I have to do to get a better/lighter trigger on my MA Compliant M&P 9, I just got off of the S&W web site after having read their new catalog. I find that there are basically FOUR models made (with two versions for three of them). 1. MS/IL; 2. MS; 3. Neither; 4. MA Compliant-Neither Safety-10 lb trigger, 10 rnd mag. The two versions of the first three listed have either 17 round or 10 round magazines.



So, from this, I deduce that ONLY those locations requiring a heavy trigger, like MA, will have a trigger problem. Only #3 has a good trigger WITHOUT the two safeties. Now we need to determine which Sear Block Assy sold by Brownell's is that one, i.e., the *Standard* one. Is it number 1 above or is it number 3??
 

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The MA trigger doesn't have a problem; it just has a heavy trigger.



In order to have the normal 6.5lb. trigger pull, you need:

-Sear block (any of the first 3 will have the same trigger pull)

-Trigger bar

-Trigger spring
 

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Here are the part numbers and listing from the Smith & Wesson parts catalog.

From these descriptions, I would think that the STANDARD has both the IL (internal lock) and the MS (mag safety).

277640000 SEAR HOUSING BLOCK ASSY - STANDARD 25A* $28.92

390900000 SEAR HOUSING BLOCK ASSY - NO IL, NO MS 25B* $25.77

390910000 SEAR HOUSING BLOCK ASSY - NO IL 25C* $24.75



I notice that Brownells does not list the part # 390900000, just the other two. :?



https://www.smith-wesson.com/wcsstore/SmWes...List_Retail.pdf
 
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