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Sig MPX PCC Review Comments Off on Sig MPX PCC Review

About 5 months ago, Sig Sauer announced the release of the MPX PCC redesigned with performance enhancements that cater to competitive PCC shooters. However, I believe the MPX PCC will also appeal to every day gun enthusiasts like me.

MPX PCC Features

  • 16” threaded barrel
  • 3 chamber compensator designed to reduce recoil
  • Crisp, flat faced, single-stage Timney trigger
  • 5-position telescoping and folding stock
  • Ambidextrous controls
  • Free-floating ergonomic Slim Line M-LOK™ handguard
  • Optics ready, black hard-coat anodized aluminum frame
  • Barrel twist rate of 1:10
  • Gas Piston Operating System
  • One, 30-round magazine (Lancer)


Overall Length: 35.25”

Overall Width: 2.5”

Height: 7.5”

Weight: 6.63 lbs


MSRP is $2,016.00 but the street price seems to be $1,699.99 most everywhere I checked.

Sig MPX PCC at the Range:

  1. Reliability. The Sig MPX PCC is very reliable. After shooting 250 rounds of Magtech 115 grain 9mm FMJ, I experienced no failures whatsoever.
  2. Trigger. The Timney, flat faced, single-stage trigger is crisp, light (about 4.5 lbs.) with no pre-travel or over-travel and breaks cleanly with an audible and very tactile reset. This trigger is really quite amazing.
  3. Handling. The MPX PCC is about a pound lighter in overall weight than the previous generation MPX Carbine with very little recoil and low muzzle rise, making it easy and fun to shoot. I also find the new, slimmer M-LOK handguard to be quite comfortable.
  4. Accuracy. I find the MPX PCC to be very accurate.

The MPX PCC is accurate, reliable and really fun (and cheap) to shoot.

Sig MPX PCC vs the Original Sig MPX Carbine

Compared to the original MPX Carbine, there are some noticeable differences.

  • Barrel. The MPX PCC has a 16″ threaded barrel with a three-chamber compensator. In contrast, the MPX Carbine has a 14″ barrel with a pinned and welded flash hider bringing the overall barrel length to 16″ to avoid Federal classification as a Short Barrel Rifle (SBR).
  • Stock. The MPX PCC comes with a telescoping AND folding stock whereas the stock on the MPX Carbine when it was first introduced was only telescoping. However, I have subsequently seen the telescoping and folding stock offered on the MPX carbine.
  • Handguard. The MPX PCC has a slim M-LOK handguard vs the bulkier KeyMod handguard on the MPX Carbine.
  • Rail. To reduce weight, the MPX PCC no longer has a picatinny rail along a large section of the top part of the handguard whereas the MPX Carbine had a full-length picatinny rail along the entire length of the top portion of the handguard.
  • Trigger. The MPX PCC has a flat faced, single stage, Timney trigger (according to Timney, pull weight is about 4.5 lbs and is the same trigger, model #683, they sell as a drop in replacement for the MPX carbine), which is much nicer than the heavier Mil-Spec trigger on the MPX Carbine.
  • Length. The MPX PCC is slightly longer with an overall length of 35.25″ vs 33″ for the MPX Carbine.
  • Weight. The MPX PCC weighs approximately 1 pound less than the MPX Carbine.

I believe that many gun enthusiasts will appreciate the performance enhancements and build quality of the new Sig MPX PCC. The MPX PCC is accurate, reliable and really fun (and cheap) to shoot.

Sig MPX PCC for Home Defense

The Sig MPX PCC can also be a good home defense option with it’s minimal recoil and crisp, light, single stage trigger, making it very easy to shoot accurately with the addition of a good red dot sight, especially if you can use quality hollow point ammo such as Hornady 9mm Luger 115 gr FTX Critical Defense.

You can also have up to 30 rounds of 9mm at your disposal in a single magazine (provided you live in a state that does not limit magazine capacity).

Need more than a 30-Round Capacity Magazine?

How about a +11 round extended capacity mag base pad from Taran Tactical? With Taran Tactical’s mag base pad, overall capacity of the Sig MPX PCC becomes 41+1 rounds of 9mm.

Cost of Sig MPX 30-Round Magazines (Gen 2)

30-round magazines (Gen 2 with tan colored follower) for the Sig MPX PCC are very expensive, so it’s best to shop around. Prices seems to fluctuate, so for instance, at MidwayUSA I’ve seen them for $49.99 each, which is about $15-$20 less than at my local gun stores. That’s crazy considering you can get 30-round Gen M2 MOE PMAGs (5.56) for about $10 each.

Putting an AR-15 Stock on the Sig MPX PCC

The one thing I didn’t really like about the MPX PCC was the factory folding/telescoping stock. So, I decided to replace it with an AR-15 stock. This required a special adapter to enable the use of a buffer tube. I ended up purchasing a Thordsen Picatinny Buffer Tube Adapter, Castle Nut, 6-Position Mil-Spec Buffer Tube and MFT Battlelink Minimalist Mil-Spec Stock. The total cost for these four items was about $130 (plus tax & shipping).

To remove the Sig MPX PCC folding stock knuckle, you will need a Torx wrench, size T27.

Putting a Thordsen Picatinny Buffer Tube Adapter on the Sig MPX PCC

To attach the Thordsen picatinny adapter and a buffer tube, you will need 2 different sized hex wrenches, a 5/64 and 7/32. The 7/32 hex wrench is needed to secure the Thordsen adapter to the rear vertical picatinny rail of the MPX, offering a clean look because there are no externally visible top or side mounted fasteners. The 5/64 hex wrench is used to secure the tiny set screw at the bottom of the Thordsen adapter to the buffer tube. You will also need a castle nut wrench – I purchased the Tapco Enhanced Stock Wrench from Thordsen Customs for just $9.99.

Sig MPX PCC Stock and Adapter Options from Sig Sauer

Alternatively, Sig Sauer offers their “M4 Style Stock” (currently priced at $149.99 on the Sig Sauer website) which includes a stock, buffer tube, castle nut and stock adapter folding knuckle. Since I didn’t need the folding stock capability and I wanted to choose my own stock (in this case, the MFT Minimalist stock), I decided against getting Sig’s M4 stock.

Sig also sells their stock adapter folding knuckle separately (currently priced at $99.99 on the Sig Sauer website), but this would require the additional purchase of a buffer tube, castle nut and stock which would have brought my total cost to about $180 (plus tax & shipping).

How Do I Like an AR-15 Stock on my Sig MPX PCC?

I find that the AR-15 stock set up offers a better cheek weld surface than the OEM stock and looks fantastic. That said, I do find that a standard AR stock (such as the MFT Minimalist stock) sits a little lower on the MPX than the OEM stock. One way to address this issue would be to position the Thordsen adapter a little higher on the MPX’s rear picatinny rail, but I think it would look a little strange and I’m not convinced it would be as sturdy.

FAB Defense GL-Core Buttstock with Cheek Rest

Another option would be to purchase a different stock that has the ability to use a cheek riser (the MFT minimalist stock does not currently offer the ability to add a cheek riser, but MFT told me that they have a minimalist cheek riser in development).

As a matter of fact, I just discovered and purchased the FAB Defense GL-Core Buttstock which offers a built-in cheek riser.  This turned out to be a great alternative to the MFT Minimalist stock and you should be able to buy it from many of the popular online stores that sell AR-15 stocks, for about $80 (comes with an interchanging tube adapter for Mil-Spec and Commercial buffer tubes). You can also purchase it directly from FAB Defense here…just be sure to check the box to add the option for “cheek raiser”. The FAB Defense stock’s integrated cheek riser provides a much better cheek weld. The FAB Defense GL-Core buttstock comes preinstalled with right and left side adapters for a commercial buffer tube, so if you are using a Mil-Spec buffer tube, you will want to remove the commercial adapters and replace them with the included Mil-Spec adapters. Also be sure to tighten the cheek riser’s allen screw to prevent it from wobbling.

Check out an image of the FAB Defense GL-Core Buttstock on the MPX PCC below.

FAB Defense GL-Core Buttstock with Cheek Rest

Sig MPX PCC with FAB Defense GL-Core Buttstock with Cheek Rest

Sig MPX with MFT Minimalist Stock

Final Thoughts About the Thordsen Picatinny Buffer Tube Adapter on the Sig MPX PCC

Fit and finish of Thordsen’s picatinny buffer tube adapter is top notch. The AR-STONER Extreme Duty 6-Position Mil-Spec Diameter Buffer Tube that I purchased for $29.99 (plus tax and shipping) is made from 7075-T6 aluminum and has an excellent fit and finish. Another plus is that all of these products, including the Tapco wrench, are made in the USA.

Sig MPX PCC with Thordsen Picatinny Buffer Tube Adapter, Buffer Tube, Castle Nut, Vortex Crossfire Red Dot Sight and MFT Battlelink Minimalist Mil-Spec Stock.

Sig MPX with MFT Minimalist Stock

Sig MPX with MFT Minimalist Stock

Sig MPX PCC with Thordsen Buffer Tube Adapter

Sig MPX PCC with Thordsen Buffer Tube Adapter

Looking for a good red dot sight for around $150 (and offers a lifetime warranty)?

Check out the Vortex Crossfire Red Dot sight which you should be able to find at your local gun store or online (i.e. MidwayUSA) for roughly $150 (street price). Here’s a link to Vortex’s website:

Interested in a great Holographic Sight for about $400 (and offers a lifetime warranty)?

Here’s why I upgraded to the Vortex AMG Razor UH-1 Holographic Sight for my MPX PCC.

Shown here with a Vortex AMG Razor UH-1 Holographic Sight

Vortex Razor AMG UH-1 Holographic Sight

So, is the new Sig MPX PCC worth the street price of $1,699?

For me, that’s a definitive YES.

For more information about the Sig MPX PCC, visit Sig Sauer’s website here.



Shown here with a Vortex Crossfire Red Dot Sight


Flat Faced, Timney Single-Stage Trigger


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