Sig MCX TacOps RIFLE IN 300 BLK

We all know AR-style rifles — and pistols — are versatile. Not only are they highly adaptable and changeable for components but they come chambered in all manner of calibers with a ton of barrel lengths and features. The SIG MCX Tacops Rifle in 300 BLK is one configuration of the hot SIG MCX line, proving once again that AR-style owners do have more fun. In a video review, Aaron Cowan of Sage Dynamics gets into the details of the rifle but also delves into what he thinks of the 300 BLK itself.

Aaron Cowan of Sage Dynamics reviews the Sig MCX TacOps rifle in 300 BLK
The Sig Sauer MCX Tacops Rifle in 300 BLK gets put through its paces by Aaron Cowan of Sage Dynamics. (Photo credit: Sage Dynamics)

What Is 300 BLK Made To Do?

300 BLK was designed by Advanced Armament Corporation (AAC)  right after they were acquired by the Remington Arms family of companies in 2012. It was meant for close-quarters work, meaning you’re not going to get good long-range use out of it, but that’s just fine for a defensive firearm used in enclosed spaces. This cartridge was also made to work well with suppressors, so keep that in mind if you plan to shoot it without one.

Some 300 BLK details:

  • Bullet diameter 0.308-inches
  • Case type rimless, bottleneck
  • Primer type small rifle
  • SAAMI maximum pressure 55,000 PSI
  • CIP maximum pressure 56,565 PSI

Is 300 BLK a Good Caliber for the AR Platform?

One of the great things about this particular video review is that Aaron Cowan gets into the details of the 300 BLK itself. This isn’t just a rifle review, it gives viewers a background on the cartridge and an idea of what to look for if they’re in the market for an AR-style gun chambered in this specific cartridge.

Leading into his review, Aaron had a few things to say:

“What appeals to me about the MCX line – specifically the Tacops, which is apparently exclusive to TALO distributors — is the fact that it’s a folding-stock, piston-driven rifle. It comes from the factory with a trainer can in place. Now, I went ahead and removed that trainer can and went with Sig Sauer’s SRD762TI, which is a direct thread, titanium suppressor. So for this review, you’re kind of getting a review of the Tacops MCX, but you’re also getting a review of the suppressor—at least in regards to the 300 BLK round.

Aaron Cowan shooting Sig MCX TacOps rifle in 300 BLK.
Aaron Cowan shooting Sig MCX TacOps rifle in 300 BLK.. (Photo credit: Sage Dynamics)

“What appeals to me mainly about the 300 BLK round, which I kind of already mentioned, is how I can effortlessly go back and forth from super to subsonic if the rifle allows me to do so. The original specs from AAC on the 300 BLK — SAAMI specs — some people just build the gun for those specifications and don’t allow for a lot of adjustment.

“One thing is, Primary Weapons Systems did is (and I don’t want to use this as a comparison, but mention it as an example) with their Mk109, is the gas system is not adjustable, which is a departure for PWS, because all of their rifles have adjustable gas. But 300 BLK, they went away from it, which tended to make the rifle kind of gassy, and left me wanting a little bit more performance — I shouldn’t say performance, a little more comfort when it came to the recoil impulse.”

 

So how does the Sig Sauer MCX Tacops Rifle in 300 BLK measure up?

Watch the video below to find out.

 

 

SIG Sauer is a respected manufacturer known for designing and producing some fantastic guns. As with any gun, choosing a rifle chambered in 300 BLK depends on your own needs. What do you need the gun to do? Is it for plinking or home defense? Do you want a truck gun? Once you’ve answered those kinds of questions it gets easier to choose your gun. If you want to check out the entire SIG MCX line, take a look on the Sig website.

Do you like 300 BLK? Why or why not?

Kat Ainsworth Stevens is a long-time outdoor writer, official OGC (Original Gun Cognoscenti), and author of Handgun Hunting: a Comprehensive Guide to Choosing and Using the Right Firearms for Big and Small Game. Der Teufel Katze has written for a number of industry publications (print and online) and edited some of the others, so chances are you've seen or read her work before, somewhere. A woman of eclectic background and habits, Kat has been carrying concealed for over two decades, used to be a farrier, and worked for a long time in emergency veterinary medicine. She prefers big bores, enjoys K9 Search & Rescue, and has a Master's Degree in Pitiless Snarkastic Delivery.

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