Battle Royale 2: M9 vs P320

Let’s compare the US Army’s old M9 to their new P320s1. I’ve got a P320F Tacops2 and Fishbreath has an M9, so we’re going to do a comparison.

We’ll start with the M9. The M9 is alloy framed, and has a double action trigger. In double action mode, the trigger has a pull weight of about 11 lbs, and in single action mode it has a pull weight of about 6 lbs. It has a frame mounted safety/decocker, a fixed forward sight, and an adjustable rear sight. The fixed front sight cannot be easily replaced with a tritium sight or a fiber optic sight.3 It does not have an underbarrel accessory rail. Side grip panels can be changed, though the grip is pretty fat.4 Small-handed users may find the safety/decocker or the trigger (in double action) hard to reach. Standard magazines come in 15 round capacity.

The P320 is polymer framed, and has a striker fired trigger. Its trigger pull is rather short and somewhat heavy at about 7.5 lbs when compared to other striker fired pistols. It is modular, and can be converted to the subcompact or compact models by swapping frame, slide, and barrel. Front and rear sights are both dovetailed, and are therefore easy to change out. There are three sizes of grip available for a given frame length, so small-handed users can find something that will work for them.

On to the direct comparison!

How do they shoot: Trigger?
This isn’t an apples-to-apples comparison. The P320 trigger is almost like a heavy SAO trigger. It’s short. About 7.5 lbs. The M9 has that double action trigger. The P320’s will be easier to shoot well, for some given definition of “well”5. The M9 will be more resistant to negligent discharges from poor handling habits. Your preference will determine which you prefer. I have not yet met a striker fired trigger or a double action trigger that will convert those who dislike the system.

How do they shoot: Recoil?
Both are full sized guns. The M9 is heavier, so it will absorb recoil better. Not that the 9 mm is some kind of superhot round.

How do the ergonomics compare?
P320 gets the nod here. It’s newer. It’s got interchangeable frames, which you can replace for about $40. So it’s very easy to get one stippled or reshaped, or try to do so yourself. Plus, there are three sizes available (note that only the medium sized one comes in the box). The aluminum structure of the M9 frame restricts grip size somewhat. You can get thinner grip panels, but that’s about it. People with normal sized hands or larger will not have trouble with either gun. People with small hands will have an easier time getting the P320 to a place that works for them. Also, the M9’s mag release is quite low, and trickier to reach. It requires a good bit of grip shifting. Aftermarket options are available to remedy this. The P320 has a nicely sized mag release that is easy to press as it comes from the factory.

How does the aftermarket compare?
It’s a pretty mixed bag. You can find cheap mags for the M9, if you don’t mind 15 rounders. MecGar makes 18 rounders which are quite good. SIG makes 17 round (standard) and 22 round extended magazines for the P320F. There are a reasonable number of sight options available for the P320. M9 front sight work requires a drill press. Wilson Combat makes a good number of aftermarket M9 parts to improve the trigger. Only Grey Guns does P320 trigger work, and they’re annoyingly closed about such things. Only now are they starting to release parts for DIY trigger work. Overall, I think the M9 wins by a little bit, but not by much. The P320 should get better given the US Military contract. Emphasis on should. Neither is looking to give Glock a run for its money in the customization department anytime soon.

And now, it’s time for the Main Event of the Evening!

Which should you buy?
Unlike my first Battle Royale, this one is a lot harder to call. It comes down to this: Which trigger do you prefer? If you like double action triggers, buy an M9 like Fishbreath, and drive on. If you prefer striker fired triggers, buy a P320 and call it a day.


  1. At the time of writing, P320s aren’t available to the general public with thumb safeties, so mine lacks this feature. Also, I don’t like it on striker fired pistols, so I wouldn’t get one if it was available. 
  2. Comes with 22 round extended magazines, TFX front sight, and Siglite rear sights. Otherwise it’s a regular P320F. 
  3. This problem is corrected on the M9A3, which has a front sight dovetail, and sights can be changed by the user. This isn’t what the Army has though, so it’s only of interest if you’re buying one. The M9A3 is also a lot more expensive. 
  4. Also corrected in the M9A3, which uses the Vertec-type grip. 
  5. Fishbreath disagrees, providing the following remark: “Striker-fired triggers are better than a DA pistol’s double action trigger and much worse than a DA pistol’s single-action trigger.” 

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