Want to have a longer handguard for your SIG Air ProForce MCX VIRTUS SBR AEG? Here is a limited edition SIG Air ProForce MCX VIRTUS SBR Ultra Long Handguard "BALMUNK" from Laylax. Just remember that installing will result in the AEG not being classified as an SBR, right? Learn more... "A set of long hand guard, outer barrel, and barrel supporter that can be attached to SIG AIR MCX. A limited quantity with different serial numbers!