Sig’s new 300 Blackout MCX in the short-barrel rifle configuration.
I’ve got some type of irrational love affair going with the 300 AAC Blackout cartridge. Maybe it has to do with my interest in reloading. The 300 AAC Blackout offers a near-infinite range of load possibilities ranging from subsonic 220 grain projectiles to supersonic 110 grain bullets and everything in between.. It’s an incredibly versatile cartridge. Compatibility with .223 / 5.56mm in terms of magazines, bolts, lowers, etc. make it an easy caliber to adopt. It’s a really versatile cartridge. Compatibility with .223 / 5.56mm in terms of magazines, bolts, lowers, etc. make it an easy caliber to adopt.
Where 300 AAC Blackout really shines is when used on short barreled rifles with suppressors. Try shooting a few subsonic rounds with a suppressed rifle and you just might be hooked. It’s crazy quiet.
I’ll have a chance to shoot Sig Sauer’s new MCX rifles this week and am really looking forward to it. According to Sig, the MCX has been designed from the ground up for use with a short barrel, suppressor, and, you guessed it, 300 Blackout.
I don’t have a lot of details yet, but here’s what we do know:
- It’s a piston design, so no buffer tube is required. That allows folding stocks or even no stock, with a pistol configuration.
- An auto regulating gas system allows proper function with 300 Blackout suppressed or unsuppressed, and full-auto or semi-automatic modes.
- It will be available to the civilian market in semi-auto as a pistol, short barrel rifle (NFA item) and pistol configuration.
- The design lends itself to easy caliber conversions, and 5.56mm and 7.62×39 versions will be available.
- The upper is compatible with standard AR lower receivers.
I’ll have a chance to test out these tomorrow and will get a range report posted asap.
The SIG MCX rifle carries an MSRP of $1,866, while the SBR variant has an MSRP of $2,058. The pistol with side-folding SBX has an MSRP of $2,132.
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The only problem with it is the safety on the right side with the folding stock. It’s difficult to reach because of the joint. It needs an external piece to lower and extend the lever.