One of Bushmaster's most popular carbine models, the M4 type features a distinctive military barrel profile and six position telescoping buttstock - great for 3 Gun Match shooting, home defense and law enforcement use. The Bushmaster A2 Type Patrolman's Carbines are modeled after the M4 Type Carbines, but with additional barrel length to make them legal for sale to individual officers (semi-automatic configuration with 16" barrel). The 5.56mm/.223 Rem. caliber 16" barrel is chrome lined in both bore and chamber for long wear life and ease of maintenance. For control of muzzle flash and muzzle rise in rapid fire, a birdcage type suppressor is factory installed. A mil. spec. manganese phosphate outer coating insures protection against corrosion or rust on the barrel and all critical steel parts of the weapon. On the A2 Type - with fixed carry handle, adjustment range is from from 300 to 800 meters (1 Minute of Adjustment elevation and 1/2 M.o.A. windage). The Bushmaster A2 Type Patrolman s Carbines are shipped complete with 30 round magazine, safety and operational manual, and carrying sling.