My 18" 223 R15 shoots great with 55 grain V-maxs. Upper and lower fit together pretty snug. the trigger was crap but I replaced it with a RRA 2 stage. Finish seems pretty tough. I cant wait to test it out on some NM yotes this fall.
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I'd rather be a CONSERVATIVE nut job than a LIBERAL with no nuts and no job.
I have a R25 243 and it shoots great.. I get 3 shot groups in the 3/4-1" with stock federal ammo.. I am working up handloads for it now.. I have a Burris 6.5x20x50 on it.
Fit and finish is just like any other volume production weapon.. I have a few days experience with them.. I'm a retired Green Beret so I have spent some time with this system before..
it is a DPMS system with the Remington name stamped on it. Trigger is mil spec so it is just like any other M4. I have not replaced it yet.. probably will but getting the groups I'm getting with it there really isn't much need.
Go to DPMS and look at all the changes you can do with it.. you will be happy with it...