Smith & Wesson M&P 15 Sport
AR-15 type rifle
This rifle lacks the forward assist and dust cover, which were later added to the MP-15 Sport II rifle.
It comes with a 10-round magazine, but accepts standard 20-round and 30-round magazines.
As with a lot of guns, I got this used, so I can't tell you the round count. Nor have I gotten around to shooting this yet.
above : stock closed
below : stock open
I have parts on order to replace the bullet button with a standard magazine release. But with the currently Corona virus supply-chain disruption, I don't know if/when those parts will arrive.
A bullet button is a device used to remove a magazine in a semiautomatic rifle, replacing the magazine release with a block which forces the user to remove the magazine by using a tool as opposed to his or her finger. This allows the rifle to comply with parts of California's firearms laws. The name came about in relation to a 1999 California law which said that a "bullet or ammunition cartridge is considered a tool."
The 2012 court case Haynie v Pleasanton validated that a bullet button is legal and rifles that have one installed are not considered assault weapons.
In 2016, California law was changed to prohibit the sales of firearms with bullet buttons.
staked gas key on the bolt carrier
The bolt itself is marked "MP", although I don't know if that's for
Magnetic Particle inspected, or just part of the M&P branding.
staked castle nut
#1: Smith & Wesson M&P-15 Sport
Smith & Wesson announced their M&P line of AR-15 rifles roughly six years ago catering to budget-minded shooters. Popular much? The Smith & Wesson M&P-15 Sport rifle review reigns supreme for TTAG traffic. In all that time we’ve never heard of a single dissatisfied customer. And we’ve heard from plenty who wouldn’t trade their gun for a pricier piece. The M&P-15 Sport is the dictionary definition of a “basic” rifle: good components, decent trigger, no forward assist. For newbie AR-15 owners or budget-minded buyers that’s really all you need.
- from "Top 3 Entry Level AR-15 Rifles"
The Truth About Guns. 02/23/2017
M&P15 SPORT II MELTDOWN!
November 30, 2017
"In this much requested video, we take a Smith & Wesson M&P15 Sport to the breaking point."
To check out the rifle’s reliability, I ran the rifle for a week out at Gunsite Academy in Paulden, Arizona.
I spent the week putting rounds down range in arid, sandy, dusty conditions – begging the Smith & Wesson M&P15 Sport to show me that it needed a dust cover. I fired standing, kneeling, and from several variations of the prone position, including rollover-prone where the bolt of the rifle was less than two inches from the dust, rock, dirt, and grime the ejection process was kicking back up into the rifles action.
Did nastiness get in to the action? Ohh yeah it did. I made sure of that by peppering the rifle with a few small handfuls of Arizona high desert when the Smith and Wesson folks weren’t watching. By the end of the week I had one gritty feeling charging handle, one rough trigger, and one dirty as all-heck action. I was also holding a rifle that continued to function without a single hiccup.
The Truth About Guns. 06/13/2011
Smith & Wesson M&P Sport II AR-15 Review: Great Budget Rifle Or Piece Of Junk? (HD)
January 30, 2017
"I've put right around 1,500 rounds through the Smith & Wesson M&P Sport II over the past few months. "
I got ahold of a Sport for T&E, with S&W understanding that I would be flogging the gun badly and reporting what I found. As noted in the Tac Wire article, I started out at a carbine course at my friend Buck Peddicord’s most excellent training facility at Defense Midwest. Since that time I have run the gun hard several more times, and currently have just under 1000 rounds through the gun.
I have run the Sport clean and dirty, including dumping sand, dirt and gravel directly onto the bolt through the ejection port. The bolt got very dirty and gritty even without me actively throwing crap onto it just due to shooting in hot, dry dusty conditions while training things like shooting from asymmetric prone.
The gun has functioned 100% so far, with Wolf 55 and 62gr FMJ and HP, Tula 55gr FMJ, Federal XM193 and XM855, Hornady custom 60gr 5.56 spec SP, Remington 55gr Core-Lokt SPs, and even some Silver Bear 55gr HPs that I had on hand that have oxidized cases and has choked every other AR I have tried it in.
I note that my test gun has the 1-9 twist barrel, and a melonite bore/chamber instead of a chromed bore. So far I don’t see this as an issue, and the melonite appears to give the chamber quite a bit of slickness to extract crappy or dirty ammo. I will note that the 1/9 twist is giving outstanding accuracy so far with M855 ammo.
- Chuck Haggard, "S&W M&P15 Sport review", 12/31/2014
read the whole thing at https://pistol-forum.com/showthread.php?14486-S-amp-W-M-amp-P15-Sport-review
Smith & Wesson M&P15 Sport
August 19, 2015
According to Smith & Wesson, in the comment section of hickok45's video:
The Barrel on the M&P15 Sport has a Maximum Corrosion Resistant Finish on the interior and exterior surfaces (Formally referenced as "Melonite"). Only the name of the process has changed, the process is the same as it always has been. Thanks S&W
Ferritic nitrocarburizing, also known by the proprietary names Tennifer/ Tenifer and Melonite, is a range of proprietary case hardening processes that diffuse nitrogen and carbon into ferrous metals at sub-critical temperatures during a salt bath. The processing temperature ranges from 525 °C (977 °F) to 625 °C (1,157 °F), but usually occurs at 565 °C (1,049 °F). At this temperature steels and other ferrous alloys are still in a ferritic phase, which is advantageous compared to other case hardening processes that occur in the austenitic phase. There are four main classes of ferritic nitrocarburizing: gaseous, salt bath, ion or plasma, and fluidized-bed.
The process is used to improve three main surface integrity aspects including scuffing resistance, fatigue properties, and corrosion resistance. It has the added advantage of inducing little shape distortion during the hardening process. This is because of the low processing temperature, which reduces thermal shocks and avoids phase transitions in steel.
Chrome-lined bores are actually coated and most companies are unable to do this uniformly. Nitriding does not add a coating, rather, it changes the surface properties by diffusing nitrogen and carbon into the metal surface to yield an extremely smooth, uniform and wear-resistant bore. Chrome-lined barrels still need outer surface protection, normally achieved by some manner of Parkerization. Since the hot liquids used in nitriding flow over all exposed surfaces in a bath, the entire barrel gets a very durable layer of protection against corrosion. A barrel that is to be chromed has to be drilled, rifled and chambered slightly oversize to account for the thickness of the chrome lining. Nitriding does not change any dimensions, so it can be applied to finished barrels.
N.R.A. Shooting Illustrated. 12/30/2017
S&W M&P15 Sport review by Nutnfancy
nutnfancy published on Apr 30, 2012