I have always wanted to get some of my guns ported, so I finally took the plunge and dropped off my Beretta M9 9mm, and my Remington 870 12ga shotgun at Mag-na-port.
A week later, they were finished. The cost was about $250 for both guns, and Mag-na-port gave me a 15% coupon to use for my next service.
The ports were cut cleaning through both barrels, leaving crisp edges and no burrs or other leftovers that I could see.
Shooting the 870
Not the v-shaped gas streams venting upwards from the ports.
Today I took the guns to an indoor shooting range that I like (Target Sports on Woodward) to test drive the ports.
The Beretta M9 was never a very hard recoiling gun to begin with, but I do think the porting helped reduce muzzle rise. It was quite pleasant to shoot. I did notice the bright orange gas streams venting upwards to either side of the barrel, but they were gone so quickly that they were not obtrusive. I need to go back and shoot some +P ammo, as I only had Winchester white box for this trip.
The 870 was still a 12 ga shoulder bruiser, but I also felt that the muzzle rise was reduced. Additional flash from the vents was not very apparent to me.
For both guns, I could not tell that they were any louder.
Shooting the 870:
Shooting the M9:
* I did not receive any compensation from Mag-na-port for this review, I am just a customer.