Sintercore’s Universal Throw Lever – The R3

Sintercore, not content to set new usability standards for the AR-15 charging handle, has turned its attention to optics. While various “throw levers” have been and are offered, they are generally not a) universal or b) inexpensive. Those that portend to be universal typically have a universal price tag.

Using modern materials and manufacturing methods, Sintercore has designed, manufactured, and is now offering their “R3″ Universal Throw Lever for variable power optics. In short, the R3 adds a lever to a zip tie allowing the user to cinch down their throw lever at a moments notice.

The R3 is low-profile, adding just .5” to the optics radius at the mounted point. Using the nylon, UV-treated, 120-lbs tensile strength Cobra mounting ties, the throw lever is quickly donned to the chosen optic, though to doff a pair or sharps are required. Fortunately, Sintercore includes a second Cobra tie for those moving the lever to a second optic.

The lever itself is a carbon fiber composite manufactured through 3D printer – laser sintering to be more specific – which ties with the company name – Sintercore.

For those looking for a throw-lever solution, the Sintercore R3 Universal Scope Throw Lever is offered directly from Sintercore for $14.98 introductory price. MSRP is set at $24.98.





Nathan S

One of TFB’s resident Jarheads, Nathan now works within the firearms industry. A consecutive Marine rifle and pistol expert, he enjoys local 3-gun, NFA, gunsmithing, MSR’s, & high-speed gear. Nathan has traveled to over 30 countries working with US DoD & foreign MoDs.

The above post is my opinion and does not reflect the views of any company or organization.


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  • nova3930

    Totally not seeing the intro price. Interested in one for my first gen ATN x-sight

    • Neal – Sintercore owner

      I just updated the listing to hit that intro price again. The information I sent to TFB was from two weeks ago, so the intro pricing had lapsed. Didn’t know if / when TFB was going to post this!

      • nova3930

        Awesome. At $15 I bought 2.

  • Bill Jordan

    Is there a cupon you have to use to get the intro price? Its showing at $25 in the cart, with no information on the intro price.

    • Neal – Sintercore owner

      Hi, I just updated the listing to hit that $15 introductory price again for all TFB readers! If any TFB readers ordered at the higher number and want a partial refund, please hit me up using the contact info on the website.

  • Keiichi

    Neat. Been looking for a nice throw lever at a good price for my Vortex PST. Take my money.

    • Neal – Sintercore owner

      Thanks! Look forward to hearing what you think of it. Shipping should be in the next few days or next week at the latest.

      • Friend

        Just for the record, the amount of time you spend responding to people on TFB is absolutely awesome. You can tell that this is a company that cares about its customers.

        • Neal – Sintercore owner

          Thanks, kind internet stranger.

  • Lee Enfield

    Take a look at these where I got 6 for ~$30 shipped from Ebay.
    This has a lot bigger lever which may or may not be what you want.

    • Neal – Sintercore owner

      Hey, I used to use those. They’re good to go for some scopes, but there doesn’t seem to be a way to tighten them down hard enough to lock against every type of zoom ring (check Amazon reviews for an explanation). They’re also really ugly and huge. That’s why I developed my product.

  • Blake

    Uhhh… how exactly would they be “not content to set new usability standards for the AR-15 charging handle” when their Tripwire charging handle is a clear ripoff of the Mega Slide Lock charging handle?

    • Neal – Sintercore owner

      Hey Blake. It’s the other way around. The Tripwire actually came out several months before the Slide Lock was released. Plus, my design uses a polymer latch that won’t wear away the upper receiver and is a bit lighter weight. You can verify the timing by checking articles posted on TFB (here’s one: http://www.thefirearmblog.com/blog/2015/01/23/slide-lock-ambidextrous-charging-handle-mega).

    • Neal – Sintercore owner

      The Tripwire was released early in 2014 and the Slide Lock was released several months later. It’s actually the other way around. Plus, the Tripwire uses a polymer latch that won’t wear down the upper receiver like the Slide Lock’s steel latch can, and the Tripwire is a bit lighter.