Does anyone know the word on the Bushmaster ACR? Would it be a nice replacement for a standard AR-15? or is it a gimmick? How about the H&K MR556? Let me know your thoughts...
Don't know a whole lot about the H&K MR556, but would like to fire one. Right now it seems to be the most expensive rifle in this type of design, you could probably get an FN SCAR for a few hundred less. There's also the Sig 556 which is by far the least expensive of this type of rifle
Most ACR setups are currently a little less expensive than the H&K and FN models. I've had one for a while now, and I love it. It's really easy to maintain, and can be quickly switched to 6.8mm with just a barrel change and popping in the appropriate magazine (my favorite feature). I've got an M4 too, but definitely prefer shooting the ACR. During the break in period for the 5.56mm barrel, I fired mostly 55Gr PMC loads. Now I mostly feed it with 62Gr XM855 SS109 rounds from Lake City. It shoots like a dream, and chews through the ammo like candy. I haven't had a single problem with it. Currently the second favorite rifle in my collection, lagging just behind my M1A/M14.
Here's an older picture of it, previously posted in one of the apocalypse threads. I've added a Trijicon 4x32 scope since then.