how does the M&P mid or full size compare to a G19 or G17 in terms of long term reliability?
This thread is not about the need for a thumb safety.
I have shot a lot of rounds with Glock 17/19/26, Glock 22/23/27 (Used 2 Glock 22s as USPSA match pistols), M&P 40/45 and M&P Shield 9mm -
https://www.thehighroad.org/index.p...-s-w-hate-decline.828775/page-4#post-10689128
In terms of long-term reliability, both Glocks and M&Ps have been very reliable with no breakage of parts for me. Since my M&Ps came with gritty 7 lb+ triggers, I did trigger jobs using Burwell PDF down to around 4.5 lbs on par with Gen3 Glocks I currently shoot -
http://www.burwellguns.com/M&Ptriggerjob1.htm
M&P Shield 9mm came with gritty trigger that jumped the front sight out of the box. After several hundred dry firing, trigger smoothed out and front sight barely moved. After 100+ rounds fired, trigger is much smoother and front sight does not move when striker is released.
The M&P accuracy issues were solved years ago before the 2.0 even came out.
https://www.thehighroad.org/index.php?threads/barrel-twist-rate-and-accuracy.780301/
S&W used different barrel twist rates for M&P 9/40 (1:18.75 and 1:24 briefly and I believe 1:16 for M&P40) and 1:10 after 2012 with 5 square cut land/groove rifling. Current advertising for M&P 2.0 shows 1:10 twist rate -
https://www.smith-wesson.com/firearms/mp-40-m20-1
Glock uses 1:10 barrel twist rate for 9mm/40S&W (1:9.84 actual) with 6 rounded land/groove rifling (Gen5 now uses conventional square cut land/groove rifling). I use 1:16 Lone Wolf and 1:20 KKM barrels for my Glocks and they stabilize various 115/124/147 gr bullets just fine and produce more than acceptable level of accuracy for me.
Here's Glock 17 vs M&P 9 accuracy comparison -
http://modernserviceweapons.com/?p=137
History of M&P 9 accuracy issue -
http://modernserviceweapons.com/?p=16423
2.2" groups at 25 yards with M&P 40L -
http://modernserviceweapons.com/?p=17008
Of course 2.2" group was with Performance Center worked M&P40L as my M&P40 never produced that small group even after trigger job. I have always obtained smaller shot groups with my Glocks over M&P 40. After I did trigger job on M&P45, accuracy definitely improved and I used it as reference testing platform for 45ACP loads until I got a Sig 1911 which is a tack driver even after 10,000 rounds.
I am unable to test newer M&Ps with newer triggers as S&W stopped selling semi-auto pistols in CA except for Shield 9/40 and SD 9/40.