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pretty sure it's the sights. I can shoot my full size pretty well. I mainly shoot at whatever the first line of targets is at Olafson. 12 yards I think... I'm consistently to the left. When I shoot the steel man target (7 yards out) if I aim directly at the head (about 4"x4") I miss. When I aim just to the right I hit it every time.
I've already pushed the rear sight to the right. My little bullet laser sight says it's on but I'm still shooting left. I guess I could be pulling, but I was nuts on with my Nano...
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If you're talking about a laser sight(the kind that replaces the rear sight or the kind that is an attachment for the grip or even an addition on the bottom of the front of the frame) those can be off. If you're using a laser snap cap like I do, they can be off too, but not enough to really notice at less than 20 yards. If you're using a laser snap cap and your shot with it is where you think it should be then that's where it will be unless:
1. You are flinching(trying to predict the recoil rather than reacting to it). Solution: Dry fire practice with a partner and randomly have them load snap caps into your magazine so you don't know when you're going to have a live round or a dummy(but they do so they can help you not end up having a horrible hangfire accident) or have them put and a cartridge or spent casing on the slide while you dry fire to see if it moves/falls.
2. Your grip is not the correct strength(squeezing too hard can create the problem you're experiencing because the fraction of a second from when the trigger breaks to the time the bullet leaves the barrel is more than long enough for you point of aim to change) Solution: Adjust your grip strength
and/or
3. Your trigger pull isn't straight back(most right handed people end up shooting low/left(between 7 and 9 o'clock). Solution: If you're using a stock m&p trigger I suggest you recenter your sights and see if you see the front sight has any right to left movement when you dry fire. The Duty Carry Action Enhancement Kit(DCAEK) that Apex Tactical makes is a pretty good fix for that problem.
I'm an M&P owner too. The rear sight doesn't really allow all the much adjustment, the front does. The front being off just a tiny bit is far more noticeable than the rear being off the same amount so make sure the front sight is DEAD CENTER(I moved them around quite a bit to try and get it just right chasing a true center and it turned out that I never needed to in the first place because it was grip strength, grip position and trigger mechanics that I needed to work on). Next Level Training(the company that makes the SIRT) has a ton of videos. Most are related to the SIRT obviously, but they can help out a lot for getting an idea of how to diagnose/fix problems like this.