My Full Size(FS) S&W M&P 9mm range kit has been a major disappointment. It was purchased new and is woefully inaccurate,it doesn't group,it patterns. Trying to hit paper past 15 yards is pointless. Ejection has been reliable but is "soft" compared to other pistols,it plops them on the ground at 3-4 O'clock a few feet away.
The accuracy complaints are with the FS 9mm platform only for some reason,not .357 SIG,40 S&W,45acp or compacts or the Shield. S&W has redesigned the barrel ,once to beef up the forward area of the barrel/hood area(
http://4.bp.blogspot.com/-Rv7Bf2A8V...AQo/cdHYF9HFmAY/s320/M%26P-Barrels-2.jpg),and the twist rate has been changed again to a faster twist from 1.18.75 then to 1-24 now to 1-10.Current production barrels have a dimple on the bottom barrel lug.
My Sig P226,BHP,Glocks,Older S&Ws 9mm,H&K,XD/XDm and Norinco 213(all 9mm) are all way more accurate than my S&W M&P 9mm. If my other pistols will give me 3-4" at 25 yards with training ammo and SD/HD ammo,why can't the M&P??
With my H&K P7 or my XD 3.8 I can put the rounds thru in one ragged hole at 7 yards,M&P makes a nice pattern or sometimes will vertically string for no reason on slow fire drills.
I had S&W check it out and they returned it saying it "was in spec" "no repairs needed" what is your spec S&W? one moa of garbage can lid. My cap and ball revolvers are more accurate.
Either the locking block,barrel or slide(ejection port/barrel hood area) are out of spec and have too much slop in those areas on some guns. The rifling at the crown disappears and doesn't look good IMHO.
Looking at getting a new production barrel and locking block,and I would like to re-crown the original barrel but others have found the steel is VERY HARD and eats carbide tooling. Word has it that the locking block dimensions were changed to tighten things up.
Two lemons out of three NIB S&W products
. At least S&W made good on my BG38 and gave me a new gun that is working well so far.