The LTR means "Light Tactical Rifle". The one I had balanced great. I really liked everything about the rifle, except when I shot it. Shot like a dog. 2" groups from a tactical rifle at 100 yds? With match ammo? Umm, something ain't right.... An $800 factory gun should shoot better than that. Bad barrel according to the factory, Remmy gave me all kinds of grief about replacing it. That's the only problem I've had with their service. Ended up parting the rifle out to recoup most of my money. I liked the gun so much that I keep debating getting another one, but I'm afraid of p-ssing my money away again on one. I really wanted to use it for hunting. Oh well. I never shot anything over 168gr in mine. All I can tell you is to try the 180's, some 1-12 barrels will shoot them, some won't. The difference between 165gr and 180gr is not worth worrying over if you ask me.
