Magpul MS1 slings: The MS1 got rid of my complaints about Magpul slings (unwanted single point hardware & open loop adjuster) and combined it with a smooth sliding adjuster, a soft and non binding nylon strap, and a reasonable price. It has become my preferred sling.
Colt 6720: I won’t spend too much time on this one since Duncan has already covered it, and I echo his thoughts on it. After picking one up earlier this year, I found the 6720 to be lightweight, quick handling, accurate, and reliable. Everything you could want an AR carbine to be.
Colt 901 MARC: After some trigger time on our 901 MARC t&e gun I prefer it in most every way over the original 901. The weight loss from removing the rails on the sides and bottom of the gun, which combined with the resulting thinner handguard profile have lead to a far better handling gun.
I found I could get a better grip on the MARC due to the thinner handguard which along with its lighter weight allowed me to run and gun with it almost as though it was a 5.56 gun. Surprisingly the reduced weight didn’t come with a noticeable increase in recoil, probably due to getting a better support hand grip on the handguard for recoil management.
All of the pros of the original 901 in a lighter, better handling package.