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Description
Holosun HS515CMThe HS515CM is a 20mm micro optical sight designed for rifle and carbine applications. Features include 7075 Aluminum Housing, Solar Failsafe, Shake Awake, 12 brightness settings, Holosun Super LED with up to 50k hours battery life, Multi Reticle System, QD mount, Kill flash, and Clear Lens Caps. Key features include: Solar Failsafe & Shake Awake Multiple Reticle System (MRS) MRS: 2 MOA Dot; 2 MOA Dot & 65 MOA Circle Multilayer Reflective Glass Up to
The HS515CM is a 20mm micro optical sight designed for rifle and carbine applications. Features include 7075 Aluminum Housing, Solar Failsafe, Shake Awake, 12 brightness settings, Holosun Super LED with up to 50k hours battery life, Multi-Reticle System, QD mount, Kill flash, and Clear Lens Caps.
Key features include:
- Solar Failsafe & Shake Awake
- Multiple Reticle System (MRS)
- MRS:2 MOA Dot; 2 MOA Dot & 65 MOA Circle
- Multilayer Reflective Glass
- Up to 50,000 Hours Battery Life (Setting 6)
- 12 Brightness Setting: 10 DL & 2 NV Compatible
- Parallax-free & Unlimited Eye Relief
- Quick Release& Detachable Mount
Comes with:
- Quick Release & Detachable Mount
- T10 L Key
- User Manual
- CR2032 Battery
- Lens Cloth
OPTICAL DATA
ReticleMOA Dot & 65 MOA Circle
Light Wavelength650nm
Reticle ColorRed
Parallax FreeYes
Unlimited Eye ReliefYes
Magnification1x
Multi-CoatingsYes
ELECTRONIC DATA
Power Source Solar & Battery
Battery Type CR2032
Battery Life (Hours) 50000
Brightness Setting 10 DL&2 NV
PHYSICAL DATA
Window Size 20mm Diameter
Dimension (in) 2.75x1.43x1.62
Weight (oz) 3.53
MECHANICAL DATA
Housing Material7075 T6 Aluminum
Surface FinishHard Anodize
Adjustment per Click0.5 MOA
W&E Travel Range±50 MOA
ENVIRONMENT DATA
Storage Temperature-40c - 70c
Working Temperature-30c - 60c
Submersion IPX8
Vibration 1000G
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- Free Standard Shipping on $100+ Orders to the USA.
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
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4.0 ★★★★★
Based on 24 reviews
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Product Reviews
★★★★★ 4
Funny and scary, but with a bit of reassurance
Format: Kindle
Reassuring and disturbing at the same time, this book exposes the flaws and risks of AI, while pointing out the weaknesses that make it incapable of taking over the world.
The examples of AI foolishness entertain and startle. AI's missteps and errors and the real harm they cause provide a warning that is easier to absorb when leavened with the humor.
So what happens if I end this review with a bit of AI-generated predictive texting? Here goes:
This is a story out of India and I am not sure if I can make it to the wrong email address. Please let me know if you have any questions. I look forward to hearing from you.
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Reviewed in the United States on December 1, 2019
★★★★★ 5
Hilarious and Informative
Format: Kindle
This book was a major hit with me - it had me in hysterics at several points while teaching me a lot about machine learning and neural networks on a deep level.
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Reviewed in the United States on April 5, 2026
★★★★★ 5
An adorable book
Format: Paperback
This is an adorable book. I bought it because I needed to know more about AI, and this exemplar seemed perfect to me. And it was.
I had already read several books on AI, dozens in fact, and let's say this is one of the best. First: the tone (the author is very nice); secondly, the drawings (always adding clarity), and thirdly, the scope (it covers all the main topics, including ethical and technological issues).
The problem with books on AI is that some authors begin to talk on AI in a very effective manner, but then, before you realize, they start pontificating on all the evils that it brings with it, and the perverse people behind the scene trying to kidnap your soul (or your money). Believe me, I tremble every time I read on AI because I know what possibly is going to happen after the first fifty pages. This is not the case. Janelle Shane goes to the point, shows you the magic, and the limits of this pervasive science, without painting the horror movie some others make you watch.
Highly recommended for all those interested in passing a couple of days of good reading on AI topics, learning on them, and enjoying a very entertaining author.
Five brilliant stars.
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Reviewed in the United States on October 13, 2023
★★★★★ 5
A fun, accessible introduction to how AI works...and how it sometimes doesn't!
Format: Hardcover
Still relevant despite recent advances in AI-generated imagery and text, because the new systems still work on the same principles as the ones that were around three years ago. They just have a lot more data and processing power. This also means they have the same limitations and blind spots. What was it trained on? *How* was it trained? (This is the most obvious way human bias can leak into an AI model.) How well is the goal specified? And of course, did the AI actually latch onto relevant details, or did it notice that all the training pictures labeled sheep had green fields and blue skies, and completely ignore the actual sheep?
These are things to keep in mind as we enter the landscape of generative AI tools like ChatGPT: You can train an LLM to write a book review, and it'll give you a great piece of text that *reads* like a book review -- but it's not going to have actually evaluated the book. For that, you'd have to train *another* AI to categorize books as good, bad, interesting, dull, and so on. But even that can only be as good as its training data. (I don't remember whether the classic phrase "garbage in, garbage out" is used anywhere in the book, but it still applies today!)
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Reviewed in the United States on April 1, 2023
★★★★★ 4
If you want a book on the details of AI without math and statistics, this is it
Format: Paperback
I had this book a year or two back and then sold a lot of books as they piled up. After that I read a good number of books on AI. Of those, Ethan Mollick's book Co-Intelligence is best for the user end. But then there was still the issue of how do they do it?
If you want to understand the process how AI works, there are a few books like this. Melanie Mitchell tends to focus on pictures. When you read ANY of these book, you will come to a page where you think "this makes no sense." You get there because the way AI chops up information and stores it in "cells" and then processes in stages (deep learining, hidden layers) is not how we think. They are not brains, though the neural network has some similarity to ours. You will simply need to finish the book. This one or the one you bought. Then read another one, if needed. It will make a lot of sense if you finish the book. Then you just generalize where you are at. I am never going to write Python or get deeply involved in tha manner. I am quite familiar with the free vesrions and I am able to check what summaries I get from AI. I will also keep up with the language part of it. AI does not study grammar the way we do. It looks for patterns in millions of examples.
I have since 2023 gone through most of the 20 dollar range books. This one is the best.
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Reviewed in the United States on April 1, 2026
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