Mag Tactical Systems AR-15 Magnesium Lower – A Light Weight Alter…



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The Mag Tactical Systems magnesium AR-15 lower is about 2oz lighter than one of my typical forged aluminum lowers. I know that does not sound like much and it is not, but if you can shave off a few ounces here and there on your AR15, the end result will be a lighter more maneuverable rifle. In my particular case I was wanting a light weight hunting rifle in the Modern Sporting Rifle configuration (MSR). So on my shopping list of parts for the 300 blackout build I went with the magnesium lower over the polymer lower. The polymer lowers just feel cheap to me even though they are lighter. The only issue I had assembling my MAG lower to the upper was the need to remove some material on the lower near the rear take down pin. This was not painful but it is nerve racking when you file on your gun. However, the end result was a perfectly fitted upper and lower with no movement between the two. Below is some comparison photos of the magnesium lower compared to a polymer, forged aluminum and billet aluminum receivers. The differences are subtle, but differences none the less. The most striking is the extra long trigger and hammer pins that came with the lower. I hear that the lower needed to be beefed up some at the pin holes. The end result is a hump where the pins pass through.

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9 thoughts on “Mag Tactical Systems AR-15 Magnesium Lower – A Light Weight Alter…”

  1. 3-13-18
    Classic Firearms on sale $44
    I've built 3 rifles when they 1st came out.
    No issues.

  2. How heavy does an aircraft aluminum weigh?
    Why do they cut down on quality for weight…god dammit…just for 3oz …go lift some weights damn pussy

  3. Seeing them for about $49 each rn. Considering you can go with the andersons for $55 without issue I'd pay the extra $6

  4. A "lightweight alternative" to save a few ounces over what an aluminum lower weighs? And then you equip it with that tall, gangly scope mount that adds weight a pair of basic rings attached directly to the rail would not? Not to mention that if light weight for a young and small shooter is your goal, an AR is a piss-poor choice to begin with.

    Because ARs are really anthing BUT light given the "firepower" of the standard cartridge. There are many youth model bolt-action rifles that would end up weighing significantly less and in addition tend to develop better and more disciplined shooters compared to semi-autos.

    I say those things being neither a proponent of super light rifles for young, inexperienced shooters or an opponent of teaching young shooters to shoot and hunt at closer ranges with OPEN SIGHTS. Getting within scoped high-power range of deer isn't very difficult and doesn't require much real hunting in most of country. And the lightest gun possible doesn't guarantee the best possible results. In fact, just like the very small pattern of a .410 shotgun can make those a VERY poor choice for a beginning bird hunter, a super light rifle can ALSO cause more problems than it solves. Some weigh and heft, especially FORWARD on the gun, actually can make the gun easier to get and keep under control and on target.

    By the way, pretty much ALL AR upper and lower receivers are "forged" in that they're machined out of billet aluminum forgings. Forging is required to get the requisite hardness for the parts. And a handful of foundries in the U.S. produce ALL of the raw forged billets ALL receivers are machined from.

    Beyond that, its nothing but a narrow range of suitable alloys and the programming of the CNC machine that determine the final weight of stripped receivers.

  5. Hit the filed area with a black sharpie. May have to touch it up now and then, but you'll hardly even notice if you do that!

    I didn't even know magnesium was an option. I don't see any down sides to using magnesium, just don't grind it up into little shavings and throw it in the fire!

  6. go with the CTR buttstock… less than an oz heavier… and the extra lockup takes all the slop out

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