M frame 2 0 and 3 0 have the advantage for me of being able to use all my m frame lenses primarily heaters if you remove the clip.
													
																	Oakley si ballistic m frame 2 0 lenses. 
									
	
		
	
																	Hdo is a collection of patented technologies that allow the industrial m frame to surpass ansi z87 1 optical standards including tests for clarity by maintaining visual sharpness at greater viewing distances refractive power by minimizing the affects of a common optical aberration that causes inferior lenses to magnify images like prescription lenses and prismatic power by minimizing. 
																	M frame alpha might have the best coverage but it is not by much. 
																	All lenses are made of pure plutonite a proprietary material that offers the highest level of optical clarity available in eyewear. 
																	Exclusive prices on official site. 
															
													
									
	
		
	
																	Oakley si ballistic m frame 2 0 sunglasses. 
																	Shop all the replacement lenses for military sunglasses available on the official oakley standard issue online store. 
																	The most obvious change from the regular m frame is the thicker more rugged frame. 
																	The m frame 2 0 additionally meets mil spec mil prf 31013. 
															
													
									
	
		
	
																	Benefits of the oakley m frame 2 0 strike replacement lens. 
																	M frame 3 0 coverage is very slightly better than m frame 2 0 but all are more than adequate.