After using the Strike Industries Strike Modular Chassis for the Sig P320, I am finally letting you know my thoughts. The Strike Modular Chassis - Alpha series, or SMC for short, is made to drop in your Sig P320 fire control unit and slide. This gives you a more controllable platform with a bunch of different accessory options.

In the box with the Alpha series Strike Modular Chassis are a bunch of other accessories. You may or may not choose to use them, but they are there. Of course there is the Alpha series SMC. But along with the SMC is an optics platform, a side charger adapter, a set of gray grip panels, and an angled front grip that also will hold an extra magazine. Various screws and allen wrenches are also included to install all that stuff. There are also some added bonuses. Like a mini figure SMC for those brick toys, a SMC patch, and a SMC pin. Those little add-ins are pretty cool.

I’ll try to explain the SMC to you, but the pictures may explain it better. It is machined from 6061-T6 aluminum, so it’s not your Grandma's plastic grip. As it sits, it looks like a pistol frame with an extension running off of the back. The extension has some QD’s on it, along with a vertical picatinny rail for attaching stuff, like a pistol brace, when they become legal again. Along this extension is also where the raised optic platform mounts. Up front is a standard picatinny rail section for attaching lights or the supplied angled foregrip/extra magazine holder. Oddly enough, there is also a hole through the front pic rail which is used to mount compensators, more on that later.

At first, I dropped my P320 FCU and a full length 4.7” slide into the Strike Modular Chassis. The FCU slid in pretty easily, but still fit snug. This slide had an optic already mounted to it, so I left it for the time being. I also installed the charging handle on the rear of the slide. One basically swaps out the backplate and then screws the charging handle on, on whatever side you want to use it on. Strike Industries also sent me their Dual Folding adapter, or folding brace. So I installed this on the rear pic rail. This was before using a brace was a problem. I also installed the foregrip. I shot it a while in this configuration. I might mention that where the rear pic rail is on the SMC, it has a “U” shaped cut-out, so you can see your iron sights or slide mounted red dot easier. While using this config, I did notice that the changing handle rubbed a little bit on the side of my optic. The charging handle moves with the slide, so it doesn't rub along the optic, it just rested up against it, causing the vibration of the firearm to rub a little wear mark in the side of the optic. The charging handle really did make it easy to cycle the slide, I can see why Strike Industries now offers it as a stand alone product. Other than the rub mark, I was pleased with how the SMC was working.

After a bit, Strike Industries sent out some more accessories to attach to the SMC. They sent the Magwell, Blast Shield, and 2 compensators. I immediately installed the Magwell as it makes reloads easier. I also installed the Blast Shield. The blast shield mounts up on the front pic rail. It gives the slide some “shields” to keep muzzle blast at bay. It also protects your hands when using one of the compensators. The Blast Shield has a lower pic rail also, so rail attachments can still be used, they just sit slightly lower on the firearms frame. I couldn’t immediately install the comps, because I needed a carry length slide with the 3.9” barrel. Zaffiri Precision was kind enough to help me out with one so that I could use the compensators.

The compensators come in two sizes, a Small and Large. The Large one has more mass and more ports, but it also is longer so it sticks out past the blast shield or dust cover. The Small comp is flush with the blast shield and barely sticks out past the pistols dust cover. Both of these comps are for non-threaded barrels only. This makes the comps 50 state legal. The comps come with a screw to mount them. They mount through the SMC’s dust cover in that previously mentioned hole. Just slide the comp into the SMC and tighten the screw. These comps will only work with the SMC and a 3.9” slide/barrel. I tried out both the comps and really liked them. The Large version seemed to reduce recoil and muzzle rise better than the Small one. But don’t get me wrong, the Small comp still did an excellent job, the Large one just worked a bit better. I would choose the Zaffiri compact slide and Small comp combo when the SMC is configured as just a stand alone pistol.

The Strike Industries SMC doesn’t come without problems. Since the SMC is a modular style chassis, it screws together in places. Mainly where the backstrap slides in. At the top, there are 2 tiny screws to hold it in place. These 2 screws loosen up and can strip the frame holes out. Strike industries now says to use “red” loctite 272 on these. They still loosened up on me and one of the screw holes completely stripped out. Luckily it was on the side where a longer screw can go. So I put a screw with a nut on it and it works fine now. Once I figure out which backstrap I want to permanently use, I will be doing something semi-permanent. So if you get one of the SMC’s, use a red threadlocker on these screws and check the tightness of them after every use. The backstrap, where the web of your hand meets it, is flat. This flat makes the pistol rub your hand a bit. If Strike Industries were to round this out, the SMC would be way more comfortable in your hand, especially after a day of hard use.

When I switched to the compact slide and compensator, I also started using the raised optics mount. The raised optic mount has mounting holes for just about any mini or micro pistol red dot, like an RMR, Shield, etc. The red dot mounting seems pretty high when you look at it, but when you are using it, it works well and doesn’t seem too tall. I really like how it has the ability to mount just about any optic.

The Strike Modular Chassis is a unique addition to your Sig P320. It gives you abilities that the stock P320’s don't. The fixed, non reciprocating optic mount works well. The compensator options are great. Having an angled front grip that houses an extra magazine is very useful, especially since you can put a 30 rounder in it. The screws that strip out are a big downer for me. But as a whole, the Strike Modular Chassis is a fun and useful addition to a Sig P320.

Firearms Insider Reviews - 8 Key Points

Claim to Fame:

Chassis system for Sig P320 handguns

Target Market:

Those wanting to convert their Sig P320 into a pistol caliber carbine or SMG style pistol

FNBs (Features & Benefits of this product):

SMC ALPHA BASE:

Over 20+ configurations
Included Ambidextrous Side Charging Handle with Slide Cover Mount
SMC Rear Module Backstrap
SMC Multi-Optic Mount (Footprints: C-More, DeltaPoint Pro, Docter/Noblex, RMR, Shield and all SIG SAUER Open Reflex Sights)
Ambidextrous QD sockets located on SMC Rear Module Backstrap
Picatinny rail located at front bottom of chassis and on Rear Module Backstrap for accessories
Spare Magazine Holder for SIG SAUER P320 with SI Modular Magazine Release is included
Uses SIG SAUER P320 OEM fitment takedown lever and P320 magazine release, SI Modular Magazine Release is pre-assembled and included
Machined from 6061-T6 aluminum

SMC COMPS: For use with 3.9” slide and non-threaded barrel