The Adams Arms Standard 5.56 Midlength Piston Upper

* Midlength Gas Piston System
* 16" Midlength Chrome Lined Barrel
* Chambered in 5.56 NATO
* M4 Feed Ramps
* 1:7 Right Handed Twist
* M4 Style Handguard and Handguard Cap
* A2 Flash Hider

http://adamsarms.net/details.asp?sku=UA-16-M-B-556