GC_UPC Aero Precision M4E1 Enhanced Complete Upper, 14.5" 5.56 Mid-Length Barrel with Pinned Epsilon 556SL, and 12" Enhanced M-LOK Handguard - Anodized Black - APAR640232M68 $654.99 APAR640232M68 show more like this Calculated in Cart Classic Firearms GC_UPC M4E1 Enhanced Complete Upper 14.5" 5.56 Mid-Length Barrel w/ Pinned Epsilon 556SL 12" M-LOK HG - Black $654.99 APAR640232M68 show more like this $8.99 Flat Rate Dirty Bird Industries