HIPERFIRE Enhanced Duty Trigger Select Fire AR15/10 M4/M16 Assembly Full auto. 5 - 5 lb Gun Model: AR-10 M4 AR-15 Gun Type: Automatic Rifle Additional Features: Curved Trigger Features of HIPERFIRE Enhanced Duty Trigger Select Fire: Significant AR Upgrade MIL Upgrade LE/SWAT Personal Utility Radical Sear Mechanics Medium Pull Weights: 4 and 5 lb. Smooth Accurate Heavy SwingFast Hammer Head Faster Lock-Up More Accurate MIL++ Heavy Duty Hammer Springs Very Hard Hammer Strikes High Power Touch Off for Ultimate Accuracy Yet Medium Pull Weights Crisp Clean Trigger Break Very Short Over-Travel Very Positive Reset You Can Feel and Hear Included Accessories: MIL Hammer/Trigger AR PINS; Drift/Slave PIN for ease of installation; HIPERFIRE Logo Decal Package Contents: HIPERFIRE Enhanced Duty Trigger Select Fire What firearm models does the manufacturer say HIPERFIRE Enhanced Duty Trigger Select Fire is compatible with? The manufacturer says that HIPERFIRE Enhanced Duty Trigger Select Fire is compatible with AR-15 M4 AR-10HIPERFIRE EDTSF: Enhanced Duty Trigger Select Fire AR15/10 M4/M16 Assembly Full auto