The ELF-SE Drop-In Trigger maintains the Elftmann reputation for quality, craftsmanship and customer service in an affordable package. Extremely short takeup, clean crisp break and very short, positive reset. It has a updated look with brand features such as, adjustable pull weight being one of them!Features :Fits any and all AR platformsAdjustable from 2 3/4lbs to 4lbs without removing from lowerPatented Double-Double torsion hammer springShort pull and reset allows for rapid follow up shotsMade of lightweight aircraft-grade aluminum & hardened steelAdjustable aluminum trigger shoe