MP 15 Sport barrel change from 1/8 5r to 1/9 6 lands and grooves. Pro's & Cons'. Any

The biggest difference in the two barrels is the bullet weight range you can use. The tighter the twist, the heavier/longer bullet you can use as the expense of losing the ability to shoot lighter/shorter bullets. Between the two that you are looking at, there won't be a huge difference.

Longevity wise, both should hold up about the same. I believe the difference in the rifling comes down to the 5R being more fouling resistant because its more of a pyramid shape than a square cut. If I'm wrong, someone will come by and correct me.
 
Hi guys, first post here. I am very interested in the results you guys are getting from the new 1/9 mill spec barrels. :)
 
I shot this with a 14.5" 1:9 CMV, unlined, barrel AR-15 I put together myself. Distance to target 100 yards, open sights A2front/Carry handle rear, cheap steel case TulAmmo, off a wobbly bench and bags.

That is some DAMN fine shooting sir, especially considering the equipment used. :cool:
 
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