Poor checking in, lol. I've had ae mk 2&3, 17' at and a 13' ax. I like the qd barrel change, but honestly the old ax or ae arent that bad to change. The at I had wasn't as smooth as either ae and the trigger wasn't as crisp or consistent. Tried the comp trigger and it was too light. The market on ae's have got a little tarded, I paid 3200 for tooley barreled ae mk3 2.0 new in 2013, and 1600 for a mk2 308 1.5, 2yrs ago. The ae at 2100-2500, depending on configuration and caliber are a nice rifle. At what I've saw some listed at, 3400+ for used 308 or 6.5, ill go with an at.