Sig MPX K For Sale
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The SIG Sauer MPX was designed to be a replacement for the Heckler & Koch MP5. The HK MP5 had ruled the sub-gun world for years and SIG decided they wanted to upset that system. To do so, they had to design a gun that was more controllable, cheaper, and just overall better than the MP5. In some regards, I think they did a pretty good job. Sig MPX K For Sale
Safety
The safety on the SIG MPX is ambidextrous and essentially an AR-15 lookalike. The right-side lever is slightly shorter so it doesn’t rub your knuckle wrong when you take the safety on and off.
However, the lever is still long enough that I can use my trigger finger to re-engage the safety as opposed to the thumb like you’d have to do with a standard mil-spec AR-15. Sig MPX K For Sale
Pistol grip
The pistol grip on the SIG MPX is a standard AR-15-style pistol grip and it looks like SIG basically copied the Magpul MOE.
For some reason, they went with the standard grip angle that they used on the M16A2, and, in my opinion, they should have used something with a much steeper/more vertical angle.
I would have liked to have seen something that closely mimics the Magpul K than the grip they decided to use, but that’s something I’ll likely switch out as soon as I can find one in stock.
Mag Releases
The magazine release on this gun, again, is a standard AR-15 magazine release on the right-hand side of the gun.
However, on the left side of the gun, it’s actually ambidextrous. It’s also well-positioned in the same place it would be for a right-handed user.
It’s easy to use in a variety of configurations.
If you had to strip a magazine from the gun, you can easily press your thumb in on the magazine release and rip it out. (I don’t see why you would do that when you can just press it with your firing hand finger, but either way you have lots of options.)
Bolt Release/Hold-Open
This gun gets a little more complicated when you start talking about the bolt release.
On the left-hand side of the gun, it has an AR-15-style ping-pong release.
The upside of this is that it does have a little bit of a lever that extends down on the bottom of that release so you can easily lock the bolt back.
It also has an ambi release on the right-hand side, but it’s only a bolt release and does not function as a bolt hold-open.
Handguard
The handguard on the SIG MPX is going to depend on the gun variant you get. I personally have the eight-inch barrel variant, which they no longer make.
The handguard on that version was quite long. I’ve since replaced it with a Lancer carbon fiber handguard, which is the same length and feels the same ergonomically but takes a little longer to heat up.
A buddy of mine has one of the Copperhead variants, and that handguard is very short and much harder to mount accessories to. That’s something we’ll cover below.
Trigger
The trigger on the MPX is essentially an AR-15 mil-spec trigger.
It’s mil-spec all the way.
To me, this feels just slightly lighter (maybe 15 percent lighter than my mil-spec AR-15s) but the reset and everything else feels exactly the same.
You have just the slightest bit of take-up/creep before you hit a wall and a rolling break. From there, you have a semi-authoritative reset right before the break again.
It’s a decent trigger, but if you’re a trigger stop you’ll definitely want to replace it.
Sig MPX K Specifications
Caliber: 9x19mm
Action: Semi-automatic
Operating system: Gas Piston
Overall length: 22.25 inches
Overall width: 2.4 inches
Height: 8.0 inches
Weight: 5.0 pounds, empty
Threads: M13.5x1mm
Accessory rail: M-LOK
Barrel length: 4.5 inches
Barrel material: Cold hammer forged carbon steel
Twist rate: 1:10
Forend type: Alloy
Grip type: Polymer
Receiver finish: Hard coat anodized
Trigger: Timney Triggers Single Stage
Magazines: (1) 30-round magazine
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