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May 11th, 2022

When Scopes Go Bad — How to Diagnose Rifle Optics Issues

Riflescope Repairs

Riflescopes are mechanical contraptions. One of the sad realities about precision shooting is that, sooner or later, you will experience a scope failure. If you’re lucky it won’t happen in the middle of a National-level competition. And hopefully the failure will be dramatic and unmistakable so you won’t spend months trying to isolate the issue. Unfortunately, scope problems can be erratic or hard to diagnose. You may find yourself with unexplained flyers or a slight degradation of accuracy and you won’t know how to diagnose the problem. And when a 1/8th-MOA-click scope starts failing, it may be hard to recognize the fault immediately, because the POI change may be slight.

How to Diagnose Scope Problems

When you see your groups open up, there’s a very good chance this is due to poor wind-reading, or other “driver error”. But my experience showed me that sometimes scopes do go bad. When your accuracy degrades without any other reasonable explanation, the cause of the problem may well be your optics. Here are some of the “symptoms” of scope troubles:

1. Large shot-to-shot variance in Point of Impact with known accurate loads.
2. Uneven tracking (either vertical or horizontal).
3. Change of Point of Impact does not correspond to click inputs.
4. Inability to zero in reasonable number of shots.
5. Unexpected changes in elevation click values (compared to previous known distance come-ups).
6. Visible shift in reticle from center of view.
7. Changed “feel” or resistance when clicking; or uneven click-to-click “feel”.
8. Inability to set parallax to achieve sharpness.
9. Turrets or other controls feel wobbly or loose.
10. Internal scope components rattle when gun is moved.

Scope Failure mechanical Point of Impact

Even expensive scopes can fail, or start to perform erratically — and that can happen without warning, or for no apparent reason. Here are some signs that you may be having scope issues.

1. Click count has changed significantly from established zero at known range.
2. Noticeably different click “feel” as you rotate turrets, or turrets feel wobbly.
3. Inability to set Adjustable Objective or side focus to get sharp target image.
4. Shot Point of Impact is completely different than click value after elevation/windage change. For example, when you dial 2 MOA “up” but you observe a 6 MOA rise in POI.

When An Expensive Scope Goes Bad — Crazy Vertical Case Study

A few seasons back, this editor had a major-brand 8-25x50mm scope go bad. How did I know I had a problem? Well the first sign was a wild “drop-down” flyer at a 600-yard match. After shooting a two-target relay, I took a look at my targets. My first 5-shot group had five shots, fairly well centered, in about 2.2″. Pretty good. Everything was operating fine. Then I looked at the second target. My eye was drawn to four shots, all centered in the 10 Ring, measuring about 2.4″. But then I saw the fifth shot. It was a good 18″ low, straight down from the X. And I really mean straight down — if you drew a plumb line down from the center of the X, it would pass almost through the fifth shot.

Is My Scope Actually Malfunctioning or Is This Driver Error?
That was disconcerting, but since I had never had any trouble with this scope before, I assumed it was a load problem (too little powder?), or simple driver error (maybe I flinched or yanked the trigger?). Accordingly, I didn’t do anything about the scope, figuring the problem was me or the load.

Problems Reappear — Huge POI Swings Affirm This Scope is Toast
But, at the next range session, things went downhill fast. In three shots, I did manage to get on steel at 600, with my normal come-up for that distance. Everything seemed fine. So then I switched to paper. We had a buddy in the pits with a walkie-talkie and he radioed that he couldn’t see any bullet holes in the paper after five shots. My spotter said he thought the bullets were impacting in the dirt, just below the paper. OK, I thought, we’ll add 3 MOA up (12 clicks), and that should raise POI 18″ and I should be on paper, near center. That didn’t work — now the bullets were impacting in the berm ABOVE the target frame. The POI had changed over 48″ (8 MOA). (And no I didn’t click too far — I clicked slowly, counting each click out loud as I adjusted the elevation.) OK, to compensate now I took off 8 clicks which should be 2 MOA or 12″. No joy. The POI dropped about 24″ (4 MOA) and the POI also moved moved 18″ right, to the edge of the target.

Riflescope RepairsFor the next 20 shots, we kept “chasing center” trying to get the gun zeroed at 600 yards. We never did. After burning a lot of ammo, we gave up. Before stowing the gun for the trip home, I dialed back to my 100-yard zero, which is my normal practice (it’s 47 clicks down from 600-yard zero). I immediately noticed that the “feel” of the elevation knob didn’t seem right. Even though I was pretty much in the center of my elevation (I have a +20 MOA scope mount), the clicks felt really tight — as they do when you’re at the very limit of travel. There was a lot of resistance in the clicks and they didn’t seem to move the right amount.

And it seemed that I’d have four or five clicks that were “bunched up” with a lot of resistance, and then the next click would have almost no resistance and seem to jump. It’s hard to describe, but it was like winding a spring that erratically moved from tight to very loose.

At this point I announced to my shooting buddies: “I think the scope has taken a dump.” I let one buddy work the elevation knob a bit. “That feels weird,” he said: “the clicks aren’t consistent… first it doesn’t want to move, then the clicks jump too easily.”

Convinced that I had a real problem, the scope was packed up and shipped to the manufacturer. So, was I hallucinating? Was my problem really just driver error? I’ve heard plenty of stories about guys who sent scopes in for repair, only to receive their optics back with a terse note saying: “Scope passed inspection and function test 100%. No repairs needed”. So, was my scope really FUBAR? You bet it was. When the scope came back from the factory, the Repair Record stated that nearly all the internal mechanicals had been replaced or fixed:

“Replaced Adjustment Elevation; Replaced Adjustment Windage; Reworked Erector System; Reworked Selector; Reworked Parallax Control.”

Source of Problem Unknown, but I Have a Theory
Although my scope came with a slightly canted reticle from the factory, it had otherwise functioned without a hitch for many years. I was able to go back and forth between 100-yard zero and 600-yard zero with perfect repeatability for over five years. I had confidence in that scope. Why did it fail when it did? My theory is side-loading on the turrets. I used to carry the gun in a thick soft case. I recently switched to an aluminum-sided hard case that has pretty dense egg-crate foam inside. I noticed it took some effort to close the case, though it was more than big enough, width-wise, to hold the gun. My thinking is that the foam wasn’t compressing enough, resulting in a side-load on the windage turret when the case was clamped shut. This is just my best guess; it may not be the real source of the problem. Remember, as I explained in the beginning of this story, sometimes scopes — just like any mechanical system — simply stop working for no apparent reason.

Permalink - Articles, Optics, Tech Tip 1 Comment »
May 11th, 2022

Travel Guides for Gun Owners — FREE State by State Booklets

Lawshield Travel guide state national PDF

LawShield, America’s largest provider of Legal Defense for Self Defense® coverage, offers a National Travel Guide for Gun Owners and state-specific Travel Guides for Gun Owners. These guides feature practical information for people traveling through nearly every state in the USA.

State-Specific Travel Guides — Access for FREE
State-specific Travel Guides and a National Travel Guide for Gun Owners can be accessed for FREE on the the U.S. LawShield website. For planning future travel, bookmark Resources.uslawshield.com/travel-guide,

Lawshield Travel guide state national PDF

Lawshield Travel guide state national PDFAccording to Kirk Evans, President of U.S. LawShield, “Because there are so many details for people to understand before they leave home, we developed state-specific guides to help folks stay on the right side of the law. Take the time to learn the laws before hitting the road because they are not the same everywhere. Don’t wait until after the fact to plan for your guns when preparing for your trip.”

Travel Guide for Gun Owners Topics:
Permits/licenses recognized by specific states
State laws you should know, including vehicle carry, duty to notify law enforcement, and open and concealed carry laws
Where you can legally carry your gun
Federal laws you should know
Carrying in National Parks
Transfer of firearms
Traveling from state to state and the Safe Passage provision
Flying with a firearm, including TSA requirement warnings and how to pack ammunition
Driving with a firearm

See Travel Guide for Gun Owners Summary (8-page PDF) »

Two Knowledgeable Attorneys Explain State Law Issues When Traveling

In this video U.S. LawShield Independent Program Attorneys Richard Hayes and Emily Taylor provide essential information for traveling with firearms. Discussion includes essential information needed to stay safe and responsible while traveling with firearms.

Know the Laws of Every State You Travel Through
“There is no standardization of gun laws within the 50 individual states, so even if a state recognizes your handgun license or permit, they may have additional restrictions on certain types of firearms, magazines, or ammunition,” said Evans. “In some states, it’s illegal for a non-resident to possess a firearm in the passenger compartment of their vehicle. And, because you are subject to a state’s laws when you are in that state, if you break their laws, you could be committing a crime — whether you think you intentionally broke the law or not,” he added.

“Remember, not knowing the law is not a valid defense,” stated Evans. “Use our Travel Guide for Gun Owners for whatever state you’re traveling through, and learn which states honor your carry license or permit before you go.”

Permalink Handguns, News No Comments »
May 11th, 2022

Brownells Contest — $9999 Prize SIG .277 Fury MCX-Spear

.277 Sig Fury MCX-Spear rifle

So, are you feeling lucky? Then you may want to head over to Brownells.com. Right now Brownells and SIG SAUER are running a cool contest, with an impressive Grand Prize valued at $9,999.00.

PRIZE PACKAGE: Brownells customers will get a chance to win a SIG MCX-Spear chambered in .277 Fury, along with a training class hosted at the SIG SAUER Academy, airfare to the class and lodging, and an SLX suppressor. The hardware and the Academy training trip have a combined value of $9,999.00.

The contest runs through May 15, 2022. Get more INFO or enter via the Brownells SIG MCX-Spear & Training Sweepstakes page. No purchase is necessary. However, the winner must be legally eligible to own the SIG MCX-Spear, and must be from a state where Suppressors and Short Barreled Rifles are legal with the ATF tax stamp.

.277 Sig Fury MCX-Spear rifle

.277 Fury — Modern Hybrid Cartridge That Delivers Amazing Velocities
The .277 Fury cartridge (shown below) is the same length as the .308 Winchester and has a unique hybrid three-piece cartridge case allowing for increased pressures that drive bullets at high velocities. The MCX-Spear is the civilian version of the SIG rifle recently chosen by the US Army as the new Next Generation Squad Weapons System.

.277 Sig Fury MCX-Spear rifle

“Right now, civilian variants of the MCX-Spear are very limited in number and almost impossible to find,” said Brownells Marketing V.P. Ryan Repp. “This giveaway is a great chance for somebody to win one, and we’re very happy we can partner with a great company like SIG SAUER to offer this fantastic prize.”

MCX-Spear Rifle Features Short Barrel and Suppressor
The MCX-Spear Prize Rifle is a Short Barreled Rifle (SBR) with a 13″ barrel and SLX suppressor optimized for this and its special ammunition. Both the rifle and suppressor are subject to Federal paperwork and rules under the ATF. Brownells will cover the $400 for the two required tax stamps. Obviously, the winner will need to live in a state that permits suppressors and short-barreled rifles.

Permalink Bullets, Brass, Ammo, Hot Deals, News No Comments »