This is a rock solid rail option, for a rail gas block build - Samson STAR EX Series AR-15 2-Piece Free-Float Handguard

I've used this particular rail handguard on quite a few Adams Arms piston rifle builds. I have always opted for the railed gas blocks. So the options for free float handguards for these builds is kinda sparse. The biggest plus for these handguards, with this build, is the fact that they are two piece. They mount to a stock barrel nut, over a fully assembled upper. The second plus with these, is that they mount "rock solid". Once locked on to the upper, it's THERE, till you go to remove it. It'll physically break before it moves. The ONLY druther with this handguard is the fact that it is a solid, 4 rail unit. ..with all the weight that goes along with that. Not the hot ticket for a race gun. But, IMHO, definitely the handguard to have for a sport utility, law enforcement, or combat rifle.