This pistol build kit includes: 

-Echo line pistol upper with; 

-Choice of 5.56, 300 Blackout or 7.62x39

-Choice of 7.5” or 10.5” Barrel 

-7” or 10” M-LOK handguard based on barrel length selection 

-Adjustable Gas Block 

-Dual Charging Handle 

-BCG 

-Lower Parts Kit 

-Buffer Tube Kit 

-Optional SBA3 brace add-on