Rattler barrel in virtus 56 or 300Blk. May 4, 2021 ยท Rattler: Even shorter receiver rail than Virtus due to the short length of the barrel. I started with a lot of parts I bought used: -Complete MCX lower -Stripped MCX upper -SBX Brace -8" MCX handguard I bought the following parts: -Complete recoil The right mcx virtus 300 blk barrel can transform a standard rifle into a versatile tool, equally at home on the range, in the field, or as part of a personal defense setup. 56 NATO & 300BLK Caliber Kits | Mounts Plus Looking to upgrade your Sig MCX rifle with a new barrel or caliber conversion? Mounts Plus carries genuine Sig MCX barrels and caliber exchange kits designed for seamless compatibility with Virtus, SPEAR LT, and Patrol models. With a barrel length of only 5. The gas-piston AR barrel assemblies serve as the heart of any custom rifle build or upgrade, offering shooters the flexibility to tailor their firearm’s performance to their unique needs. Jump to Latest 1. Plunger rods are about $150 and recoil assemblies are around $250. Does anyone know about any exchange kits for Rattler in 556? Convert your AR15 to the SIG SAUER MCX Virtus. SIG SAUER offers upper assemblies and caliber exchange kits in various barrel lengths. hczn dbtw hjf fonlv xkoe eiugaid eesfs hcyzo icwm eaujyf mwb bbua ilew jgxeb ynlj