I have been on again off again shopping for a M4 upper to go with my M16.
My M16 has an original 20" pencil barrel upper. I have started to really like the weight and feel of original A1 uppers, triangle handguards and all. I have a aimpoint on a goose neck off the carry handle and it works out fine for plinking.
I still have a urge to get a 14.5" barrel just because I can do it legally. All the flattop uppers that I find are $800 to a $1000. I like the looks of the flattop with the Aimpoint mounted forward, but $800 is a decent chunk of change for what you are getting.
What I am wondering is what is all the fuss over the short barrel uppers? Are they really that much handier than a lw 20" barreled upper?
Knowledgeable Comments appreciated
In close quarters they are definitely handier but of course the trade off is slightly slower velocities. I have 2 M4's and love them both but I wouldn't want to depend on them at ranges over 100 yds if I had a choice of them vs. your 20" version. It really depends upon what your primary use for the weapon will be.