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Mar 9, 2011 · ArmaLite advertises that the M-15’s 1:9” twist is appropriate for 52- to 69-grain bullets, but the 64 bullets seemed to be under-stabilized. The smallest group with the 64-grain bullets was 2.1” and was strung out vertically. There was no stringing with the 55-grain groups, and the smallest group was 1.3”.
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5 days ago · For AR-15 rifles, the twist rate is a critical factor in optimizing bullet performance. Although the original AR-15 rifle designed by Eugene Stoner was designed with a 1:14 twist rate for the lighter projectiles of the time, and standard issue AR-15s still have the same, modern common rifling rates for AR-15s include 1:7, 1:8, and 1:9, with each suited to different bullet weights.
Armalite®, Inc. October 2015 Rev 25 (I-7) P/N: MANUAL Eagle 15. 525 E. Pinnacle Peak Rd. Ste 100 Phoenix, AZ. USA 85024 623-780-1050 www.Armalite.com. 1. READ THIS FIRST! Throughout this manual you will find WARNINGS and/or CAUTIONS printed in bold print.
Common Twists and Rules of Thumb. 1-14 - This is uncommon, but used in varmint bullet weights in both 223/5.56 and 204 Ruger. This is also the twist for really early M16s. 1-12 - This is the traditional twist for mid-models of M16s. It is also common in bolt guns used for varmint hunting, and is one of the most popular twists for 204 Ruger.
- How Rifling Works
- How to Match Ammo to Twist Rate
- OK – Now What?
It all starts with rifling. A rifle’s barrel is cut (by one means or another – that’s a separate topic covered in our blog about types of rifling) into lands and grooves. The land is the part of the barrel that is not cut, while the groove is the “trough” cut into the barrel. The cuts go in a spiral around the inside of the barrel. The bullet, when...
Let’s get things going with matching ammo to twist with this chart for the .223/5.56mm. Let’s try to follow my rule of thumb above… understand that innate accuracy will be better if you keep the “small-number-twists” for the longer and heavier bullets, and the “larger-number-twists” for the lighter, smaller ones. Of course, there are exceptions… as...
Learning about rifle barrel twist rates isn’t high on the list of most shooters… unless they like one-hole groups at ridiculous ranges. Going the other way, ever seen a target with a perfect silhouette of a bullet cut through it? The bullet keyholed due to insufficient stabilization and went sideways through the target. Not a good thing. Granted, f...
Sep 20, 2018 · The early M16A1 utilized a rifle twist rate of 1:12 to stabilize the 55 grain M193. After the adoption of the M16A2, the military started using a 1:7 rifle twist, which was faster. The rifling made a complete revolution within 7″ now instead of 14.”. We are talking twice as fast.
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The M15TAC16 features a 16″ stainless steel barrel, and a 15″ ArmaLite tactical handguard yielding ultimate versatility with a wide range of M-LOK attachment points and a full-length MIL-STD 12 o’clock rail for optics. ArmaLite M15 Tactical Rifles come standard with adjustable gas systems allowing for smooth, reliable cycling and an ...
