Improving Rack-Grade AR-15s

Achieving high performance from low-bid uppers.

by Joe Carlos

I mostly write about National Match Course guns but also have valuable information on making battlefield guns perform better. This article will show how to shrink group sizes with AR-15s built with skinny A2 contour, chrome-lined issue barrels down to around two minutes of angle with M193 55 grain ball ammunition. This will also work M855 62 grain (green tip) but groups will usually be fatter because that ammo isn’t as precise. The quality of the barrel will have a huge vote in the outcome and, unfortunately, there are many substandard chrome lined ones out there. The specific lot of ammo will also be important.

Read more in our December 2014 issue. Back issues are available.

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