Barrels are tapered to fit their suppressors and muzzle devices but can be adapted if needed. Based on the MPX it was designed ground up as a stand-alone system. Even the trigger is different, looks the same, operates the same, but it’s different. ![]() An adapter allows an MCX upper to work on a standard lower, but they are otherwise incompatible. While the piston system is similar to most short stroke gas systems, there is no buffer tube or buffer in the MCX, it’s all inside the upper receiver. By the end of the event that had all changed. My “just another piston AR” filter went up quickly. So, when invited to a media event introducing the latest MCX, the Virtus, it was mildly interesting. Many of their rifles have been military submissions or simple unit requests. Having tested a bunch of Sig Sauer firearms, they always seem well thought out and thoroughly tested. After testing hundreds of AR’s, getting excited about anything AR is difficult. When Sig Sauer introduced its MCX it was mostly a rifle caliber MPX to me, anything but earth shattering.
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