Bushmaster AR-15 Lower Receiver ACE Skeletonized .223 Remington Black AR-15 Lower Receiver

A: Hi Joseph, No it isn't mil spec -- Specifications and Features: Accepts any standard AR-15 type upper receiver -- Neoprene foam cheek piece -- ACE Skeleton stock -- Multiple sling mounting options -- A2 style polymer grip -- Folding trigger guard -- Standard lower parts kit -- Forged lower receiver -- Teflon coated black anodizing -- Includes buffer and spring -- Description : AR-15 Lower Receiver Multi Caliber Marked Ace Skeleton Stock Standard -- 7075 T6 aluminum. Standard trigger. Black

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A: No it isn't mil spec -- Specifications and Features: Accepts any standard AR-15 type upper receiver -- Neoprene foam cheek piece -- ACE Skeleton stock -- Multiple sling mounting options -- A2 style polymer grip -- Folding trigger guard -- Standard lower parts kit -- Forged lower receiver -- Teflon coated black anodizing -- Includes buffer and spring -- Description : AR-15 Lower Receiver Multi Caliber Marked Ace Skeleton Stock Standard -- 7075 T6 aluminum. Standard trigger. Black

A: Joseph, this Bushmaster AR15 Lower is not "Mil-Spec".

A: This is what's called a "commercial" assembled lower, though a mil spec upper and mil spec parts will fit the lower housing.

A: No it isn't mil spec -- Specifications and Features: Accepts any standard AR-15 type upper receiver -- Neoprene foam cheek piece -- ACE Skeleton stock -- Multiple sling mounting options -- A2 style polymer grip -- Folding trigger guard -- Standard lower parts kit -- Forged lower receiver -- Teflon coated black anodizing -- Includes buffer and spring -- Description : AR-15 Lower Receiver Multi Caliber Marked Ace Skeleton Stock Standard -- 7075 T6 aluminum. Standard trigger. Black