February 8th, 2020

Zediker Examines Long Range Shooting with AR-Platform Rifles

AR15 ar-15 long range

Looking to shoot an AR-platform rifle out past 500 yards? Then you should read two articles by AR guru Glen Zediker. Author of The New Competitive AR-15 and The Competitive AR15 Builders Guide, Zediker is an expert when it comes to AR-platform rifles. Glen believes ARs have excellent long-range capability, provided they are built to high standards, with good barrels.

Glen says: “a properly configured AR-15 is easily capable of good performance at 500+ yards. Good performance means it can hit a 1-foot-square target all the time. Competitive shooters can cut that standard in nearly half (the X-Ring on an MR1 600-yard NRA High Power Rifle target is 6 inches, and high X-counts are commonplace among more skilled shooters).”

Published in the Cheaper than Dirt Shooter’s Log, Zediker’s articles first cover the history of the AR-15, and then explain how AR-platform accuracy can be optimized. Part One reviews the AR’s development as an accurate firearm, tracing its evolution from a Vietnam-era combat weapon to what is now a favored target rifle of High Power competitors. READ PART ONE.

Long Range AR AR-15 Glen Zediker Cheaper than dirt

Part Two discusses the specifics that make an AR accurate at 500 yards and beyond. Zediker talks about barrel configuration (profile and twist rate), bullet selection, floating handguards, and proper mounting of optics or iron sights. READ PART TWO.

Long Rang AR AR-15 Glen Zediker Cheaper than dirt

Here are some highlights from Long-Range AR-15 Part TWO:

Barrel Twist Rate
To stabilize anything longer than a 68- or 69-grain bullet, the barrel twist rate must be — at minimum– 1-in-8. Twist rates reflect how far the bullet travels along the lands or rifling to make one complete revolution. So, 1-in-8 (or 1-8, 1:8) means “one turn in eight inches.” I think it’s better to go a little faster in twist. There is nothing wrong with a 1:7 twist. The 90-grain bullets require a 1:6.5, and that is getting on the quick side. If you want to shoot Sierra 77s or equivalent, and certainly anything longer, 1:8 is necessary. By the way, it is bullet length, not weight, which constitutes the necessary twist rate to launch a stable bullet.

Optics Mounting
Correct optical sight positioning can be a challenge. With a flattop upper, I need a good inch additional forward extension at the muzzle side of the upper for the sight mount bases to avoid holding my head “back” to get the optimal view through the scope. A longer rail piece is necessary for my builds as a result.

Buttstock Length and Adjustment
An adjustable buttstock is valuable, and even more valuable if it’s well-designed. Mostly, a standard stock is too short, and the cheek area sits too low. Adding length helps a lot by itself. There are assemblies that replace the standard buttplate to allow for length and, usually, height and rotation adjustments for the buttpad. An elevation-adjustable cheekpiece is a big help to attain a solid position.

Permalink Gear Review, Shooting Skills 6 Comments »
December 5th, 2016

DIY Black Rifle Starts with Stripped Lower — Get One for $49.99

Anderson Mfg. stripped AR AR15 lower Colt AR $49.99 Sportsman's Guide

Can you buy a new firearm for fifty bucks? Yes you can, when the “firearm” is a stripped lower receiver, the key component of an AR15-type rifle. With an AR lower, you can build your own “black rifle” project, which could be a gun for Service Rifle competition, or a specialized varmint-slayer, or a rig for 3-Gun matches — the choice is yours. Once you have the serialized lower (which must be transferred through an FFL dealer), you can build your own project as you see fit, with the trigger, barrel, stock, handguards, and sighting system of your choice.

Right now Sportsman’s Guide is offering a great deal on Anderson stripped lower receivers. You can purchase the lower for just $49.99 ($44.99 for Buyer’s Club Members). These are good-quality lowers, with correct mil-spec dimensions, and precision-machined to ensure drop-in installation of aftermarket components. Crafted from 7075-T6 aircraft-grade aluminum forgings, the made-in-USA Anderson lowers have a hard-anodized black finish. The take-down pin has a standard 0.250″ diameter.

Permalink Gunsmithing, Hot Deals 1 Comment »
June 7th, 2016

Hot Deal: Aero Precision Stripped AR Lower for $59.99

Aero Precision Stripped AR Lower Receiver Brownells $59.99

For sheer versatility, it is hard to beat the AR-15 platform. An AR can function in a multitude of roles — defending your home, hunting varmints, or competing in Service Rifle or High Power matches. If you’re planning a new AR project, it all starts with the lower. That’s the part that carries the serial number and is logged into the books of your FFL. Once you’ve got your lower, then the fun begins — you choose all the other components: trigger group, stock, handguards, and upper.

Right now, Brownells is running a great deal on stripped lower receivers. You can get an Aero Precision Stripped Lower for just $59.99. It’s hard to beat that price. Aero Precision is a good manufacturer that makes durable and dimensionally-correct lowers. And these lowers are backed by Brownells’ 100% Satisfaction Guarantee.

Aero Precision Stripped AR Lower Receiver Brownells $59.99

Aero Precision Lower Receiver Features
This small pin, mil-spec lower receiver is precision-machined from a 7075 T6 aluminum forging. This versatile lower can be the foundation for rifle builds on 5.56/.223, 6.5mm, 6.8mm, 300 AAC Blackout, 9mm Luger, or other chamberings. Holes, inletting and pin locations have been cut to final dimensions and accept standard AR-15 magazines and components. The safe/fire switch position indicators are stamped on the receiver. FFL required for purchase.

Permalink Hot Deals, Hunting/Varminting No Comments »
October 23rd, 2014

Amazing Price: $49.99 AR-15 Stripped Lower at Brownells NOW

Got fifty bucks? Well that’ll buy you an AR Lower this week. Quite simply, this is the best AR deal we’ve seen this year, and one of the best values on a firearm receiver we can remember. Right now, while supplies last, Brownells.com is offering Bushmaster-brand AR-15 stripped lower receivers for just $49.99. You read that right — you can get a major manufacturer AR lower for under fifty bucks. That’s a savings of $120.00 off the normal price. Get them while you can.

AR15 AR-15 lower stripped receiver Bushmaster

NOTE: Stripped lowers are considered the firearm, so this must be delivered to an FFL-holder. It is fairly easy to complete the lower with readily available parts and the trigger group of your choice.

AR15 AR-15 lower stripped receiver Bushmaster

Bushmaster Stripped Lower Receiver Product Description
Receiver is a rigid 7075 T6 aluminum forging with extra metal in the right places for added strength without unnecessary bulk. Features a beefy, M16A2-pattern reinforced area around the front pivot pin, a strengthening ridge over the receiver extension threads, and a ridge around the mag release button to guard against accidental magazine drop by preventing unintentional button activation. Bead blasted after machining to ensure a uniform, non-reflective surface before application of lusterless black military hardcoat A8625, Type III, Class 2 anodized finish that adds surface strength and resists abrasion. A final, nickel acetate seal coat provides extra protection against corrosion. Stripped lower is the perfect companion for Bushmaster Lower Receiver Parts Kit, available separately

Permalink Gunsmithing, Hot Deals, Tactical 2 Comments »
July 17th, 2012

New Polymer AR15 Lower Receiver from ATI

ATI Omni AR15 lower polymerAmerican Tactical Imports (ATI) has introduced its new ATI Omni Lower Receiver, a multi-caliber AR15 lower made of reinforced polymer. Since it was designed to milspec dimensions, ATI claims the Omni polymer lower is compatible with most current AR15 lower parts kits, grips and stocks. ATI says the durable polymer material “can withstand harsh environments as well as everyday wear and tear.” The Omni lower will be available as either a stripped lower, OR a complete finished kit including all lower internal parts and collapsible stock. ATI claims the Omni lower has tested reliably with .22 LR, 5.56×45 (.223 Rem), and .410 but is “not recommended for larger calibers“.

ATI Omni AR15 lower polymer

The Omni stripped lower has an MSRP of just $49.95 while the complete finished kit has an MSRP of $129.95. The Omni lower comes in either black or dark earth colors. The .22LR version is available now. The .223 (5.56) version is slated for release in August, 2012, and a .410 version will be offered in the fall. To learn more about the ATI Omni Polymer AR15 lower, visit www.AmericanTactical.us.

Editor’s NOTE: This story is based on a press release by ATI. We have not examined or tested the product. Accordingly we can give no opinions as to fit/function, durability or safety. Likewise, we cannot venture an opinion as to whether the ATI Polymer lower would be legal in restrictive jurisdictions such as California. Nonetheless, this is an interesting technology that may prove useful in some applications. For example, the inexpensive ATI lower could work well with the Crosman MAR177 AR15 Airgun Upper, keeping total system cost down.

Permalink Gunsmithing, New Product 8 Comments »