If you absolutely positively must go out and buy your own gun to go through the academy (still find it hard to believe) I will make this recommendation to you…
Go buy either a Glock 17/19 or a S&W M&P 9mm new in the box. My own choice would be the 19 as I find it easier to conceal and I like carrying the same gun all the time if I can. Slap a set of nightsights on it (if it doesn’t come with them) and call it a day.
Why 9mm? Because it is generally easier and cheaper to shoot than 40 S&W and you loose very very little in terms of ballistic performance. Being cheaper means you can practice more which means you will ultimatley be more proficient (so long as you practice solid methods).
If you must have a 40 S&W then go with the M&P. I was an armorer at a Glock 22 agency and have owned three of them in the past (note I said “past”) myself. There are well documented issues with that particular Glock model. I’m currently issued a S&W M&P 40 and think it’s a great gun (just went through the armorers class with DocGKR in fact).
Ultimately you’re going to do what you want, but thought I’d throw in my 2 cents worth ![]()