Pre-owned Windham Weaponry MCS WW-MC in 300 AAC Blackout caliber with interchangeable 5.56 barrel. If you are looking for a fully interchangeable combo gun, look no further! Windham's patented barrel lock system makes swapping your .300 barrel with the included 5.56 barrel a breeze! One flip of the MCS's locking spring allows you to twist the locking lever on each side of the lock housing and VOILA! Off comes the barrel! The finish on this gun is in excellent condition, showing only very minor wear and handling marks. Both barrels are bright and shiny with crisp rifling and wear A-2 flash hiders. The telescoping stock is the basic 5 position style. Along with both barrels, also included is a custom Plano hard case, sling