PCC 416 R Stainless 14" Barrel with MBX Stainless Compensator Pin and Welded.~ All MBX Barrels will be tested for accuracy to meet the High Standards of Quality of MBX Products~ All Barrels will come with the tested target and informative information regarding your New MBX Barrel- Custom designed 14" to our specs for durability and light weight- Extended throat for 1.150 OAL bullet length- 11 deg crown with 1.10 Twist for superb accuracy- Specific pinning/alignment shoulder for rock solid compensator attachment to meet ATF regulations 16.1" long with pinned MBX Compensator.- Many hours of testing and development to get the best possible performance as our proven tall wall aluminum design.- The 300 series Stainless Compensator has wider chambers and increased side ears.- Surface area that really traps and diverts the expanding gases.- Along with the very aggressive 22 deg angle to really make use of the gas available.- Produces the best and fastest sight track possible back to the point of origin.- When combined with adjustable "Patent-Pending" Buffer system you get the softest shooting blow back gun available.