My AR is a complete BCM upper on a PSA lower. The OCD in me wants to buy a BCM lower so its all the same. But the rational part of me is trying to figure out why I need to spend $400 on a lower. The BCM lower does have their A5 system and their enhanced LPK. 
Is there any really functional reason to spend $400 for the BCM?
	
		
			
		
		
	
			
			Is there any really functional reason to spend $400 for the BCM?
				
		
					