There are many options available in the EE, what's your budget? I'm assuming you want something that does what an AR15 does; ie: a 5.56 semi that accepts stanag magazines and magnified optics. The MR1 is a good choice, but look into the other options too and make comparisons. I have had my MR1 for many years and I love it, but I ended up buying an M17s over the summer and enjoy shooting it too. I've shot the XCR and they're really nice, I would have considered picking one up if I found an example for less than 1500, which seems to be my budget limit per rifle. T97 is worth a look if you want to keep it cheap and upgrade as you go. I'd steer clear of the SU16, but maybe it's my keltec prejudice.