Ghost rings for me pick up just fine, especially since I'm cross dominant (left hand strong side right eye dominant), so my eye picks up the rear sight since its closer and its actually a bit easier a lot of times for me to keep sight picture - depending on the bead, my dominant eye (right) will sometimes wander over and I'll have to do a half squint, not ideal, and yes I know I could just shoot right handed, but I make accomodations that work for me -
OP - Nothing wrong with the 20" A1, it will definitely be heavier with that longer barrel and the heavy-walled barrel of the A1 - Personally, I don't see enough of a difference with the 18.5" vs. 20" except for weight and OAL so I keep my 'defensive' setups as all 18-18.5" - the 20" gives one additional round in the tube, than an 18.5" with a +1 mag extension, for me I'd rather lose 1 round and have a more compact and lighter weapon -
But the 20" A1 is the iconic setup with the bayonet lug as welll - you really can't go wrong with it -
For the cost - this is hard to beat from Vang Comp - for 1K you get their full treatment including Cerakote on barrel over the parkerized, parts, and inspection, and they sell a +1 mag extension so you would get 7+1 out of this setup! Its a lot of gun for the money - Considering a 20" A1 sells for 600-650+ out the door with current street prices, I'd honestly spend the extra bucks for the Vang Comp setup!
The VC764 is Vang Comp's core Mossberg shotgun that is ready to rock right out of the box - but still has room for customizations and upgrades when you're ready. – 18.5″ Heavy-Walled 12ga Barrel with Vang Comp System and Ports – Metal Trigger Guard – Ghost Ring Sights – VCS Stainless Steel...
vangcomp.com