Thanks for the review.
I really don't think the port makes much difference with the blast. The 642 already makes a huge fireball at night. I wish I could get it on camera.Thank you for the observations, especially the chron info. I love my 642, but wish it had a sight like the new PowerPort version. Would you describe the muzzle blast from the port as distracting, noticeable, or negligible? TIA