Hopped onto this thread a little late but hey. As far as an AR-15, There are a lot of brands to avoid (though i cant remember what they are right now, as im in Afghanistan. Century Arms is one of them.) but Primarily, What exactly are you looking to Get out of the gun (configurations or entirely different weapon system)? Plinking is great, Stopping Power is quite lacking so if you are looking for Home Defence, Go with something else entirely.
As a Platoon Armorer, I can tell you they are VERY easy to work on and/or replace parts. I Do Recommend that if you do get one, go with a Gas Piston Model (so it doesn't blow all the gasses back into the bolt assembly and other moving parts in side). Very fun to Shoot, especially when you put custom grips and buttstocks, etc.. on the weapon.
Hope that helps Some, Dont have much time on the net here.
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