I think it's great that folks are coming out with ways to use relatively cheap 5.56 brass to churn out various new cartridges. I'm sure they all work well for what they are designed to do. More options can't really be bad thing I guess and I'm a fan of the 6x45 (223 case necked up to 6mm) myself. When RobArm announced their 6x45 we called it a "same bolt conversion" because it uses the common 5.56 bolt. In that respect it's a way for someone to "up gun" on the cheap and would work with the ACR as well. Though ideally you'd have still want a new bolt.
I don't know though, 223 is still cheaper to shoot and that's what I look at really.
I am really excited about this one ,only downside is using a dedicated magazine- Wilson is modifing Lancer AWM mags and has them in stock FWIW, but its truly a 30 cal . hunting solution-ATTENTION :Bushmaster? Freedom Group:we need barrel parts ASAP!!!!!!!!!!!!
Actually, standard mags will work according to the info release, ya just gotta down load'em for realiability. There are so many options for rifles that use the AR mags, but like said, parts are needed to bring these options to the shooting bench.
just went out this morning and put 5 rnd.s of 125 gr. 7.62 x 40 through the ACR, gas port is oversized as it still cycles on the "S" SETTING but I am having good luck loading 20 rnd,s at a time in ASC 6.5 Grendel mags so maybe I wont have to have modified lancers to achieve high capacity I really want to shoot a deer with this setup!!