[M1A4ME]

It's not just porting the barrel. The slide should be "ported", too. The expelled gas has to go somewhere without blowing out inside the slide.

I know barrel porting on a 5" M&P 9MM works. Felt it, seen it, and like it.

Not sure I've seen/felt the difference between our ported 9MM Shield and unported 9MM Shield. Could be there, just not sure I've noticed it when shooting them.

I'd forgotten about MagnPort. I used to think about sending my 4" M29 to them but just never got around to it almost 40 years ago. Yeah, they've been around for a long time.

 

[M1A4ME]

I see the flash from my 5" PC 9MM slide (ported barrel and slide) while shooting it in the shade or under the overhead cover at the range. Not sure how bright that would be at night. I do see the white dot on the front sight looking "dark/dingy" at some point when I'm shooting it. A quick wipe with my finger/thumb will brighten it up again. Or on my t-shirt tail.

The best thing I did for my 5" 2.0 FDE 9MM was buy an Apex barrel for it. If I can find a 124 grain hollow point load that shoots like the Winchester 124 grain FMJ NATO ammo I'd be happy with it. The Apex trigger kit made the trigger awesome, but didn't make the pistol shoot better groups.

I've had zero function issues with the tighter barrel in the 2.0 5" pistol. But, the statement that they have tighter internal dimensions is absolutely true. You'd need to do a plunk test with new/different ammo before taking the gun and ammo to the range and you'd need to shoot the ammo a good bit to insure it functions correctly.

You guys better quit talking about how accurate the Shield Plus is or you're going to talk me into buying one.