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This rifle was built for the price conscious user who is looking for a good quality and inexpensive AR15 style rifle for range practice and/or home defense. They were able to do so by changing some features that should NOT upset the majority of target shooting users out there. The barrel used is made in house - 16 without m203 cuts, melanite coated inside and out, 1:8 twist rate, and 5R rifled. The 5R rifled barrel designs have been in use by Thompson Center, a S&W owned company, for a long time in order to produce an inexpensive and very accurate product. Those looking for a milspec rifle, this isn't the one for you, but melanite has proven itself a durable, corrosion resistant, uniform coating that can be considered more accurate than chrome lining. Other differences on the Sport models include: an upper receiver lacking a dusk cover and forward assist, a lower receiver with integral enhanced trigger guard, LMT style removable rear sight and A2 style front sight, chromed gas key and bolt carrier and other standard A2 styled parts. For those budget conscious shooters out there looking for a rifle that offers good quality with a low sticker price, the M&P15 Sport rifle may be just what you're looking for.