A comparison of real steel Sig MCX Spear LT vs LMT MRP rifles in this video of 11.5 piston uppers by the Dirty Civilian... "On paper, these two guns are nearly identical. From barrel swaps, to piston designs, they seek to accomplish the same goal in different ways. Still, one was made nearly 20 years before the other, so what's the difference?"

In one of the presentations at the TFB Gunfest, they give an overview on the SIG Sauer MCX Spear NGSW Rifle... "In this episode of TFBTV, James Reeves meets with Jason St. John of the SIG Defense Strategies Group to talk about SIG’s entry for the NGSW (“Next Generation Squad Weapon”) service rifle, the SIG MCX Spear in 6.8x51mm.