The SOCOM M4 Block II Barrel and Ammunition
BY Herschel Smith
Before you dive into the video (and it’s a very good and informative video), I have some remarks. Ignore them if you want to dive straight into the video.
First, QC is a subset of QA, QA being a function of not only QC testing, but engineering, management oversight, problem reporting and resolution, and so on.
Second, the word accuracy is the most misused word when concerning firearms. Most of the time a rifle can be made accurate by adjusting the iron sights or optics. What most people refer to when they say a rifle is accurate or not accurate is precision. A small group on the target at the point of aim is both accurate and precise. A large group at the point of aim is accurate but not precise. A small group not at the point of aim is precise but not accurate, but can be made to be accurate by adjustments. A large group not at the point of aim is both inaccurate and imprecise. Accuracy can be adjusted into a rifle. Precision cannot. Precision is a function of the rifle and ammunition. Precision has to do with repeatability and statistically similar outcomes with increasing sample size.
And that last point is important. The Daniel Defense rifle did well compared to the Block II rifle, but they both suffered from imprecision. They are not 1 MOA rifles. Or are they?
With the right ammunition they both can be, as can be a lot of rifles that don’t shoot 1 MOA or better. Mass produced military ammunition isn’t high QC grade ammunition. To get good AR-15 ammunition requires buying those $1.50 – $2.00 rounds of .223 made by Hornady and other manufacturers who spend time and money on QC.
Both QA and QC costs money. It costs as much as the component does in most cases. If you want your rifle to be a 1 MOA or better gun, shoot high-QC ammunition. That means the powder has been metered, the bullets are not out-of-round, the center of gravity (CoG) is located at the centroid or thereabouts, etc. If you want to practice rapid fire, or fire under movement, purchase bulk military grade ammunition. If you want to shoot with precision (smaller groups), buy high quality ammunition. It will cost money.
Yes, barrel harmonics has something to do with all of this, as does machining tolerances, but the main point here is that good ammunition changes everything. He proves that right up front in the video.