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Are you sure you want to do this? Your RRA already has an superb complete upper (excellent barrel and my preferred midlength gas system) and it would be a shame to waste it. Why don't you just buy a RRA Varmint complete upper and have two guns in one? What information made you decide to make such a drastic change on a brand new rifle? You can do whatever you want of course, but I am curious.

A civilian, especially in an arid state like Texas, does not need a chrome lined barrel or stainless barrel. Just clean the bore after every shooting session and your barrel will last a long, long, long time. The chroming process can be uneven, so usually a non-chrome lined barrel (like the one you have now) will be more accurate.
 

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FYI, getting the barrel off of a RRA tactical Entry is much harder that it should be. The barrel nut on mine was so damn tight, I had to buy a 1/2" socket wrench to put on the armourer's tool, and then a 4 foot cheater bar on it to get it to budge.

Also, do your self a favor and ditch the UTG rails and get a free float set up. If you still just want non-free float get something other thanthe UTG.
I agree with you. This project could turn out to be worth much less than the original. I picture the upper receiver crushed or distorted in a vice. I have a UTG front sight tool that is surprisingly well made. However, I don't know if I would build my dream rifle around a UTG non-free-float quad rail. At the gunshow I went to this weekend there was UTG stuff at every other table. If I were to appraise a brand new RRA A4 middy vs. a custom job with UTG parts, the RRA middy would be worth twice as much to me.
 

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You can do what ever you want and the AR-15 is one of the best modular gun systems to modify to your every whim. It is just that you currently own my favorite brand and model of rifle and it is hard for me to imagine it being so radically altered when I consider it already perfect. I am also thinking about your best interests regarding your RRA's resale value and lifetime warranty. You can still find RRA 20" NM complete uppers (with free float tube hidden under standard-looking A2 hand guards) as they are not as popular with the tactical crowd.
 

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The first post on this topic did not explain WHY the OP wanted to swap barrels on his brand new RRA midlength LAR-15. I was trying to pick his brain as to why he felt compelled to change out a brand new barrel. I was thinking that perhaps he heard that chrome lining is a military requirement and that chrome lining is a key buzzword when selecting an AR. My point was that the military's reasons for specifying chrome lining are based on different needs and conditions compared to civilians. A soldier may submerge his rifle in a river crossing, carry it in damp jungle conditions, delay cleaning it in times of battle, or store it in suboptimal non-climate controlled conditions. A civilian will generally pamper his rifle and clean it regularly. To chrome a barrel, it must be over-bored as the chroming process adds material. This added layer may or may not be the correct thickness to correct the over-bore. The chrome tends to fill in some of the rifling and can be uneven. True, a properly chrome lined barrel may last longer, but a well-maintained chromoly steel barrel will last a very very long time.

Rock River Arms has their barrels made by Wilson with a 1 MOA accuracy guaranty on the OP's model. Not many mass producers of AR have an accuracy guaranty, which speaks for the high quality of RRA barrels. I don't think it is necessary to replace the very high quality barrel on this practically unfired rifle, unless it eventually does wear out (in a few civilian lifetimes, perhaps, at today's ammo prices).
 

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Regarding humidity, it is generally not a factor in deciding barrel material (or chrome lining) for civilians. However, humidity WAS a key factor in the military's decision to chrome line barrels. A lesson learned in the Pacific War during WWII was that chrome lining the barrels of M14s decreased corrosion. The first version of the M16 did not have chrome lining. the fouling of the early M16 version (most likely due to a change in propellant and the disguided idea that the new rifle did not need cleaning) was partially blamed on the lack of chrome lining. The decision for the M16A1 (and subsequent M16A2) to have chrome lining was made during conflict in the jungles of Vietnam, which I hope we can agree is a humid place. This military's decision to chrome line is based on extreme, wet, harsh, and humid conditions. Conditions we civilians are unlikely to face. Now carry that over to some who say that since the military requires chrome lining that it should be a requirement of a civilian rifle.

For a civilian, especially one living in the desert Southwest, chrome lining to prevent corrosion is not neccessary. If you live along the brackish water of the Louisiana Bayou, it might be a factor. If your goal is ultimate accuracy, a non-chrome lined barrel would be better. 1/2 MOA accuracy is not a military requirement of the M16. For less barrel corrosion in all environments the military is willing to sacrifice some accuracy.
 
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