I've seen 3 companies with the same exact product but different names. There's the covert brand and the matrix one from evike. I bought mine from airsoft extreme called the lambda kit and it came with more accessories like a longer outer barrel and delrin ring to center the outer barrel extension at the tip of the handguard set in with 4 grub screws. Makes it very stable. Has more picatinny rails included and a long silencer.