After @BermudaIndustries brought to (Keet's) attention that the Mk.6-A1 is outdated, I decided to make a new SPAR for CAT A6. It features a keymod (whatever that is) handguard with a section for angled rails in addition to the ones on the side and bottom. It also uses the stock from the UPM's spec ops SPAR variant, and it has -an increasingly shortened- barrel.
No Violence Intended, this is not a real firearm and should not be taken seriously.