NLX-25 556 Linear Compensator- Direct the Flame The NLX-25 was developed along side the NLX556 pistol. by Next Level Armament. It was designed to direct the blast from short barreled firearms away from the shooter, while having a smaller footprint than competing products. Add one to your next pistol or SBR build and experience the difference. 1/2 x 28 TPI overall length 1.5'