A few reasons to buy a Sport over an OR, depending on your needs:
1. The Sport comes ready to shoot with an F marked front sight base and detachable dual aperture rear sight. The OR has neither, so you would need to buy front and rear sights or optics to shoot your first round out of the OR. When comparing cost, add the cost of sights to the OR before deciding.
If you're looking just to shoot out of the box, you can get some decent sights, as good as the sports, for $50 or less. Sorry, not really a deal breaker. Of course, I did say patience. This is the key. 90% of people buying a new "TOY" are impatient.
2. The OR barrel is a 1:9 twist, 6R rifling. The Sport barrel is a 1:8 twist, 5R rifling. The Sport's 1:8 twist barrel will stabilize heavier bullets than the OR. The 5R rifling gives a better gas seal and causes less deformation of the bullet jacket, which should provide higher velocity and better accuracy.
This is definitely a bad excuse. Trust me; if you're the person who is so knowledgeable about AR's, and are going to be a major serious shooter, and you really know the difference between a 1:9 and 1:8 twist barrel, and not just repeating things you heard on the internet; then you wouldn't even be considering the M&P15 in the first place. You'd be looking at the 1:7 twist barrels on a Colt, BCM, LMT, Daniel, Nove, etc... Sorry, not even an issue for someone buying an M&P. Plus; the 1:9 twist is good for ANY ammo up to around 70 grain bullets. Anyone shooting anything heavier than that, probably is reloading, because you're mainly going to find 55 and 62 grain bullets in commercial ammo. Sometimes 75 grain. Again, the twist difference is not relevant for this type of buyer.
3. The OR barrel is chrome lined. The Sport barrel is melonite treated. Melonite treating provides a surface hardness comparable to chrome, but does not change the dimensions because it is not a lining. Melonite treatment should avoid the loss of accuracy that can sometimes result from chrome lining. The Melonite treatment will certainly be more wear and corrosion resistant that the unlined chromemoly barrels that some lower end AR's come with. The Melonite treatment also reduces friction between bullet and bore. The Melonite treated, 1:8 twist, 5R barrel on the Sport is, on paper, a higher quality barrel than the OR barrel. Time will tell how the two compare.
Definitely just an opinion. The melonite is definitely better at resisting corrosion than a chrome Moly, but not over chrome lined. As for accuracy, there is nothing that says or proved that melonite is better than real chrome. It's simply cheaper to produce. If it was better, colt, lmt, bcm, daniel, etc... would be using them.
4. The other critical components appear to be identical (M4 feedramps, same BCG, S&W 6 position collapsible stock).
I was a first time AR buyer who was perfectly happy with iron sights, so the Sport made sense for me because it doesn't lack anything that I want in an AR and offers considerable quality for the price.
As a first time AR buyer, you definitely would appreciate the cost of an M&P15-Sport. And for what the average first time AR owner would want, it's definitely a good deal. My point is/was/and will always be; the M&P15-OR is a BETTER RIFLE than the "Sport". Anyone who would disagree, really doesn't understand AR's. Now, is the OR worht $200-$300 difference in price; especially for the NOOB AR owner? Definitely NOT!!! However; as I mentioned in the previous post, if you are patient, can shop around, and can buy the M&P15-OR for the SAME PRICE, or LESS, than the SPORT, why would you even think of getting the SPORT? The OR is a BETTER rifle. Only the Impatient person wanting a rifle TODAY would try and rationalize getting the Sport over ANY of the other M&P15 line, IF THE TWO WERE AT THE SAME PRICE!!! If they aren't at the same price, that's a different story. If you can get the sport for significantly less than $650, then definitely go for it. But it's NOT the same quality as the M&P15 line of rifles.
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