Tag Archives: Discovery Optics

Shooting Sports

BCA BC10 Bolt Action 308 AR Fixed

A few months ago, I tested the Bear Creek Arsenal’s BC10, a budget-priced bolt-action AR chambered in .308/7.62×51. BCA is known for making budget-priced ARs and components, but also for cutting corners on QC and construction. My experience with my BC10 was a rough action that with a bolt that would lock up and groupings on target that looked like a novice shot them.

After I published the video, I received some helpful comments from BC10 owners on how to improve the action. Some said they had to cycle the bolt a ‘couple hundred’ times before it broke in. I didn’t have that spare time or patience.

I stripped down the rifle, swabbed and cleaned the barrel, took apart the bolt, and cleaned all the moving parts with CLP. Following the same process as with the BCA BC15 I recently fixed, I carefully polished the bolt face lugs that engaged the star chamber. I was careful not to grind metal or round out the lugs. My goal was to mechanically simulate running the bolt hundreds of times, rubbing off the Parkerizing or whatever black finish BCA coats their parts with. After reassembly, the bolt no longer lock up, though the action still felt a bit rough. Next time I clean the bolt, I’ll sand smooth the guide block on the top of the bolt. But for now, I wanted to test the lug tune-up.

In addition to my goal of fixing the bolt’s action, I also wanted to see if this improved the BC10’s shooting performance. I wanted to make sure the optic could reliably maintain zero, so I put in one of my most reliable scopes. I installed an ED-LHT 3-15×50 with a new heavy-duty DGSM mount.

At the range, the BC15’s bolt was a significantly improved experience. The bolt cycled without locking through the first couple of cartridges failed to eject properly (possibly due to some buffing compound that might have stuck in the ejector?) It makes me wonder why BCA didn’t polish the bolt lugs, at the factory, this would add perhaps 5 minutes of work on their part. A pittance that most users would have gladly paid an extra $25 in retail price. It seems short-sighted on BCA to leave it to users to fix their headache, which only reinforces negative feedback on their products.

Sadly, while my fix helped the action of the bolt, it did nothing for how the rifle shot. My groups were just as bad as my first test (and that rifle was straight out of the box with all of the packing grease!) I would get at least one random flyer in each 5-shot group, and the group themselves were over 3 MOA. This .308 bolt-action AR was grouping more like Mil-Spec 5.56 AR at 100 yards.

The main benefit of the BC10 is its price. Unfortunately, my Savage Axis bolt-action rifle outshoots my AR10 and was even cheaper.

SHOP

Bear Creek Arsenal BC10 in .308 https://alnk.to/gzZKwzC

Discovery Optics ED-LHT 3-15×50
https://discoveryopt.com/   (10% discount link: MOONDOG)  

Discovery Optics DGSM mount https://amzn.to/4vtJCtD

OSight X multi-reticle red dot https://amzn.to/4vz1jbd

Osight Picatinny adapter https://amzn.to/3S6H7z5

SPECS

Magnification 3x-15x
Objective 50mm
Field of View 12.6M-2.5M@100YDS
Eye relief 88mm-83mm
Exit pupil 11.97mm-3.3mm
Tube diameter 30mm
Click Value 0.1MRAD
Elevation Adj ±23.2MRAD
Windage Adj ±17MRAD
Length 333mm
Weight 792g (27.9 oz)

Shooting Sports

DiscoveryOpt DGSM Heavy Duty Mount

The DGSM Heavy Duty Mount is truly a heavy-duty scope mount milled from a solid block of 6061 aluminum. The tops of the rings are milled along with the lower rail, which means all of the pieces are precisely aligned and fitting. 2 recoil lugs and 4 oversized 30in/lb Torq screws will secure the entire mount and scope solidly to a heavy recoil rifle.

Furthermore, the mount comes with an all-metal diving board which can be screwed onto either ring top. This allows the addition of backup red dots or laser ranging units with its 6-slot Picatinny rail.

With a street price under $75, this mount is one of the most affordable long-range precision scope mounts with all of these features.

SHOP

Discovery Optics DGSM mount https://amzn.to/4vtJCtD

Discovery Optics ED-LHT 3-15×50
https://discoveryopt.com/   (10% discount link: MOONDOG)  

Bear Creek Arsenal BC10 in .308 https://alnk.to/gzZKwzC

OSight X multi-reticle red dot https://amzn.to/4vz1jbd

Osight Picatinny adapter https://amzn.to/3S6H7z5

SPECS

Magnification 3x-15x
Objective 50mm
Field of View 12.6M-2.5M@100YDS
Eye relief 88mm-83mm
Exit pupil 11.97mm-3.3mm
Tube diameter 30mm
Click Value 0.1MRAD
Elevation Adj ±23.2MRAD
Windage Adj ±17MRAD
Length 333mm
Weight 792g (27.9 oz)

Shooting Sports

BCA Bolt Action Upper Fixed

I tested Bear Creek Arsenal’s BC15 bolt action AR upper and it was far from a stellar experience. BCA is known for making budget-priced ARs and components, but they also have a reputation for budget-quality construction. Out of the box, the BC15 had a rough action, as you can see in my review video.

I received some helpful comments from BC15 owners to improve the action. I stripped down the bolt and thoroughly cleaned and lightly lubed it with CLP. Reassembling, I still found that the lugs would catch and the bolt would not release reliably. I disassembled the bolt again, this time I put a buffing wheel on a Dremmel and carefully polished the lugs until I could start to see shining metal. I was careful not to grind and round out the lugs. My goal was to mechanically simulate running the bolt hundreds of times, breaking it in. After reassembly, the bolt finally ran clean and smooth.

I mated the BC15 to my Anderson lower with a CA-compliant Hera CQR stock, the same lower I used to originally test the BC15. I swapped out a Discovery Optics ED-PRS 5-25×56 for a ED-LHT 3-15×50; a smaller and lighter scope that has the same clear Japanese ED glass. I also used a Discovery Optics Lightweight cantelever mount for a better eye relief.

At the range, the experience with the BC15’s bolt was night and day compared to my original video. The bolt ran smoothly as a bolt action should run out of the box. It makes me wonder why BCA didn’t polish the bolt lugs, as I did before assembling the BC15? At the factory, this would add perhaps 5-10 minutes of work. But BCA could increase the price of the already dirt-cheap BC15 by a modest $50, which is far less than they probably pay a workshop employee per hour. Just a thought.

The ED-LHT was also a better scope for my budget AR build. It is smaller and lighter than the ED-PRS while giving me more than enough magnification and clarity to see my 4″ target diamonds at 100 yards. Though neither cleaning the bore nor adding the ED-LHT improved my 2″ group, this is still tighter than any group I’ve shot with my normal semi-auto AR.

SHOP

Bear Creek Arsenal BC15 https://alnk.to/7McEe5X

Discovery Optics ED-LHT 3-15×50
https://discoveryopt.com/   (10% discount link: MOONDOG)  

SPECS

Magnification 3x-15x
Objective 50mm
Field of View 12.6M-2.5M@100YDS
Eye relief 88mm-83mm
Exit pupil 11.97mm-3.3mm
Tube diameter 30mm
Click Value 0.1MRAD
Elevation Adj ±23.2MRAD
Windage Adj ±17MRAD
Length 333mm
Weight 792g (27.9 oz)

Shooting Sports

Hold Em or Fold Em Challenge with a DiscoveryOpt LHT 3-12×42

My YouTube friends @Dayattherange and @Hazzbro1964 created a deceptively tricky .22 rimfire challenge target called Hold Em or Fold Em. https://dayattherange.com/holdem-or-foldem/5/

This timed challenge, you have 10 shots to hit 10 targets from 50 yards. Each playing-card-themed target is smaller than a postage stamp on a letter-sized sheet of paper. From 50 yards, a postage card looks like the head of a pin.

For my attempt, I was shooting a factory Ruger 10/22 takedown rifle. This can be the least accurate model of the 10/22 because the optics rail is not directly connected to the barrel. I mounted a Discovery Optics LHT 3-12×24 light-weight budget FFP scope. But even at 12x, the individual target squares were tiny, and their edges were barely perceptible.

I ran CCI Standard Velocity rounds, which this rifle shoots well, but it’s not match-grade ammo. I DQ’d almost from the start. I only managed 3 clean hits out of 10. This result will probably place me in the TRAIN WRECK division of this match.

I hope to try this again, but next time I’ll be shooting from a folding table or from the ground, prone.

SHOP

DiscoveryOpt Website: https://discoveryopt.com
10% Discount Code: MOONDOG2A

Amazon: https://amzn.to/4ofFcnH 
10% Discount Code: MOONDOG2A


DiscoveryOpt LHT 3-12×42 SFIR
Shooting Sports

SHOT2026 Discovery Optics

At SHOT Show 2026, Discovery Optics showed off the prototype of an innovative internal electronic angle level in their ED and XED scope line. This electronic feature displays a green dot on either the left or rght side of your view indicating if your scope is not level. Canting (tilting) a scope can cause your point of impact to shift due to the position of your scope above your barrel.

Long-range shooters have relied on externally mounted spirit bubble levels. This internal electronic level allows the shooter see when their scope has lost level without breaking their shooting position or cheek weld to look at an external level indicator.

This new internal level feature will come standard in all of their ED and XED scopes, which will dramatically differentiate their scopes from other long-range optics.

SHOP

https://discoveryopt.com
10% discount code MOONDOG2A 

Shooting Sports

DiscoveryOpt LHT 3-12×42 SFIR

The LHT 3-12×42 is Discovery Optics’ most affordable crossover scope. This scope has the lightweight, slim profile of a traditional 3-9x hunting scope, with an FFP tactical reticle for precision target shooting. In addition, it features exposed locking turrets and an illuminated reticle.

The LHT’s turrets had some wiggle between each 1/4 MOA click, but the clicks were audible and tactile positive. Its parallax focus can target as close as 7 yards, making it an ideal optic for airgun or rimfire hunters. Its illuminated reticle is twilight bright with highlighted dots at key points.

Optically, it had a good eyebox but was not tack sharp from the center to the outer edge, which showed distortion and softening. Its clarity and brightness dropped off significantly above 10x. The glass also showed some CA at high magnifications. While optically average, the LHT’s features make it a better value than most 3-9x scopes below $150.

BUY

DiscoveryOpt Website: https://discoveryopt.com
10% Discount Code: Moondog

Amazon: https://amzn.to/4ofFcnH 
10% Discount Code: MOONDOG2A

RESOLUTION

Group -2 / Element 4

SPECS

Magnification: 3-12X

Objective.: 42mm

Tube Diameter: 30mm

Click Adjustment: 1/4 MOA

Elevation Adj. Range: 86 MOA

Windage Adj. Range: 60 MOA

Focal Plane: First

Parallax Adjustment: 10Yds-Infinity

FOV @ 100y: 35.6 FT(10.8 m)-8.7FT(2.6 m)

Exipt pupil diameter(mm):13.3-3.3mm

Eye relief: 86-87mm (3.4 inch)

Length: 304mm (11.9 inch)

Weight: 480g (16.9oz)

Shooting Sports

RPR Ammo Test: Aguila HV vs. CCI Mini-Mag

Aguila Super Extra High Velocity and CCI Mini-Mags are my go-to 22LR for my pistols and semi-auto rifles. Super Extra HV is usually cheaper but CCI runs more reliably on more of my pistols. Both are 40grn CPRN bullets with only a 20fps difference in their velocities. While Super-Extra HV claims faster speed, Mini-Mags shoot with more pronounced pop.

Testing both in my factory Ruger Precision Rimfire Rifle (RPR), Aguila edged CCI by a significant margin (2x) in the data. CCI did experience more random fliers than Aguila, causing worse scores. But looking at the groups, the differences between the rounds appeared subjectively closer.

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Discovery Optics LHD

Discovery Optics website use 10% Off code Moondog: https://www.discoveryopt.com/DISCOVERYOPT-LHD-8-32X56SFIR-FFP-Z-optics-Scopes.html

Amazon 10% discount code: Moondog832 https://amzn.to/3Ck6nu2

RESULTS

Aguila Super Extra HV
Avg. Group Size: 2.17″
Average: 2.07 MOA
Mean Radius: .83″ / 0.79 MOA

CCI Mini-Mag
Avg. Group Size: 3.43″
Average: 3.28 MOA
Mean Radius: 1.21″ / 1.15 MOA

Shooting Sports

MPVO with a Reflex better than an LPVO?

A few months ago, I tested and reviewed the Discovery Optics HD MVPO 2-12×24 and thought it was a great general-purpose optic, whose only shortcoming was its usability at CQB distances due to its reticle and lack of daylight-bright illumination. Earlier this year, I also tested the excellent new OSight X multi-reticle pistol reflex sight. I wondered if both of these could be paired together to make an ideal combination sighting system.

I bought a low-cost piggy-back mount that is a scope ring with a small Picatinny rail. I attached this just forward of my turrets to allow me enough space to manipulate my elevation without obscuring the turret. Using an RMR/Picatinny adapter, I mounted the OSight X atop the scope. An added benefit was that the combo was actually lighter than most 1-10x LPVOs.

High-power optics are great for general-purpose use and hunting, but generally poor at distances closer than 50 yards. Iron sights and red dots are excellent for fast target engagement, but are limited by a shooter’s naked eyesight. A number of solutions have been invented to bridge the gap: LPVOs, low-power prism optics, red dot magnifiers, and piggy-back/angled reflex mounts.

For a practical test, I fielded this optical setup at a local falling plates match. I wanted to see if this setup was better than the LPVO I usually use to good effect. The first obstacle I had to overcome was that having a reflex atop my scope didn’t give me enough room in my rifle bag. I had to zip the bag, leaving the Osight X and cover poking out and exposed.

When shooting the red dot at closer distances of the match (30-45 yards), I utilized a heads-up shooting position. In theory, this is a major advantage in CQB threat environments as it affords a less obstructed peripheral view than an LPVO at 1x (and less visual distortion). But in practice, since the falling plate targets were always directly in front of me and there were no random threats that could pop up, the wider peripheral view was moot.

When I got to the 45-yard stage in the match, I found that the red dot suffered due to my aging vision and the size of the dot obscuring the 8″ targets at this distance. I switched to the MPVO at 2x, which was better than the red dot at this distance, but it lacked a bright enough reticle illumination in the variable lighting conditions.

In theory, this reflex/MPVO combo should have been a great setup, but in practice, it was far from perfect. Admittedly, my performance could be improved with further practice, but its advantages aren’t as significant compared to a traditional LPVO for CQB and action shooting matches. Adding a reflex sight to any long-range optic would be helpful as a backup sight, but with the trade-off of extra bulk and complexity.

BUY

Official Website: https://discoveryopt.com/ (10% Discount Code: Moondog)

Amazon: https://amzn.to/4ofFcnH (10% Discount Code: MOONDOG2A)

Discovery Optics HD 2-12×24
OSight X

Shooting Sports

One Year Later: ED-LHT 3-15×50

I posted a review of the Discovery Optics ED LHT 3-15×50 FFP scope over a year ago. At the time, I found it and the entire ED line of scopes to be an excellent value. The 3-15×50 variant was the smallest and lightest of the ED series, with the same precision turrets and high-resolution Japanese ED glass. But it had a tight eyebox, and its tree reticle was unusually thin, even at its maximum magnification. This is probably because it uses the same etched reticle as the 24x ED variant, and when a FFP reticle is scaled to 15x, it shrinks in size and thickness.

A year later, I decided to mount this scope onto a BCA 22LR AR upper, so I could use it at 100 yards. I thought the fine reticle would not obscure the 2″ diamond bullseyes on my target, while allowing just enough top-end magnification to self-spot from the bench.

While zeroing out the scope at the gun range, I invited the RSOs and club members to test out my setup. I wanted to see if their opinion and first impressions of the scope differed from my original review. Their consensus echoed mine. The scope had clear glass, but most found the eyebox to be tight, and many were not used to a reticle that thin and fine-lined. Despite this, when I revealed that the scope cost under $275, most were surprised and nodded in appreciation.

The scope certainly performs better than its price, but its thin reticle makes it less than ideal for general-purpose shooting or hunting. It may be a better scope for airgun or rimfire Benchrest, where its thin reticle helps in aiming at the X-ring on a well-lit target?

BUY

https://amzn.to/44uCWAZ (12% discount link: MOONDOG315 ) 
https://discoveryopt.com/   (10% discount link: MOONDOG)  

RESOLUTION

Group -1 / Element 4

SPECS

Magnification 3x-15x
Objective 50mm
Field of View 12.6M-2.5M@100YDS
Eye relief 88mm-83mm
Exit pupil 11.97mm-3.3mm
Tube diameter 30mm
Click Value 0.1MRAD
Elevation Adj ±23.2MRAD
Windage Adj ±17MRAD
Length 333mm
Weight 792g (27.9 oz)

Discovery ED-LHT Gen2 3-15×50
Shooting Sports

Discovery Optics DGCM Mount

Discovery Optics updated their Lightweight Scope mounts (which had an unfortunate typo of the name on the box, “Lightweinght”), which I reviewed last year. This new version has been named the DGCM-L and is available in 1.5″ and 1.93″ heights. The DGCM has a 34mm ring size but includes high-quality aluminum shims to adapt the mount for 30mm scopes. Like the previous version of this mount, it is made with aircraft-grade 6061 aluminum with lightening cuts to reduce its weight.

The DGCM mount and shims are notable for coming pre-lapped, with smooth bare metal interiors coated with a wax to protect them from corrosion. This extra smooth surface creates a stronger contact and grip with the rings, the shims, and your scope tube. The rings are paired and lapped with their bases for extra precision. Discovery went so far as to label the ring tops and bases to identify the ring to its base and to prevent accidentally reinstalling the ring tops backward.

Moreover, the rings were designed with an alignment pin to seat the ring top to the base for additional precision and added sheer strength. This level of extra finishing and design is not typically found in mounts or rings under $200. These rings have a street price far less than half that, at around $80. This is why I consider these to be the best budget mounts you can buy.

BUY

https://amzn.to/4o2FKNA (10% discount code:MOONDOG6061)

https://discoveryopt.com/ (10% discount code: Moondog)

SPECS

Tube Diameter: 30mm/34mm

Height: 1.5″

Length: 5.7″

Material: 6061 Aluminum

Weight: 200g (225g with shims)