When the bullet is sealing the bore, a longer barrel means more pressure is contained for a longer time. The smaller or larger the gas port size, the slower or faster the gas enters the system. The farther back or forward the port is located, the sooner or later. Bullet weight is a factor also: heavier bullets accelerate more slowly (This is also the reason heavy bullets erode the chamber throat faster than lighter bullets). Read the full story to understand pressure curves and port pressures.
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A barrel-twist rate is expressed in a chain of numbers that reflects on how far down the barrel a bullet must travel to make one full rotation. To fully understand barrel twist, read this article.
In Part 2, High Master Glen Zediker writes about important considerations in choosing a barrel for your AR-15, including contours, length, life expectancy, crowns, cryo treatments, and chambering choices. Read this article article to learn more.
The difference between a rifle that shoots well and one that shoots very well is in the barrel. The standard for “shoot well” is ultimately subjective, but some manufacturing factors contribute to accuracy, the author explains, and some don’t.
Many AR-15 shooters don’t get barrel twist rates and chambering nomenclature throws them for a tizzy. Here’s a detailed explanation that will help you understand both.
Being able to hit your target with your AR-15 is a big factor in your enjoyment of it. Here are some tips on sights, triggers, cant and hold that can improve your ability to shoot well.
Part 1 of this series described the path the AR-15 took to become a viable longer-range rifle. In Part 2, Glen Zediker gets into the details of ammunition and gun accessories to make the 500+ yard AR a reality.
Cheaper Than Dirt! has a ton new freebies including articles from a host of leading industry personalities and a new sweepstakes where you can win free gear (no purchase necessary) but you do need the details to win!
The AR-15’s bolt and carrier are the heart of the rifle, so knowing the ins and outs of the bolt carrier — weight, platings and coatings, firing-pin hole size, and bolt choices — can make your AR run more smoothly and reliably. Read this post to discover how to keep your AR-15 working properly with the right bolt carrier assembly, firing pin holes and firing-pin retainers.