The SOLGW M4-EXO2 Pistol is a great complete AR-15 pistol that comes with all the features you want for a reliable, do-it-all gun built for duty. This model features an 11.5” barrel machined from 4150 chrome moly vanadium steel and QPQ Nitride finished inside and out. The six groove 1/7 twist rate is optimal for heavy 62 grain 5.56 NATO surplus ammunition. The pistol length gas system and appropriate gas port size ensures reliable function under any conditions and minimal recoil. The government profile barrel and gas system are protected by the EXO2 free float handguard with M-LOK slots for full customization potential. This AR pistol goes through a rigorous inspection and testing process to ensure the gun you receive will be reliable for years to come.