Frog Arms, LLC

  We wanted to see how the Hoffman Tactical TK-15 Trigger Kicker performed. At the time of writing, it retailed for just $43.00, making it an affordable upgrade for anyone interested in experimenting with their AR-15 trigger system. Installation is straightforward if you're familiar with a standard AR-15 mil-spec fire control group. The TK-15 simply replaces the factory disconnector and disconnector spring. It is designed to work with mil-spec hammers, triggers, and two-position safety selectors. Our test rifle required a minor modification because we were using an AT3 Tactical flat trigger. The rear portion of the Trigger Kicker's channel was slightly tighter than a standard mil-spec curved trigger, so we lightly filed and polished the contact area until it moved freely. We also chose to install a mil-spec ambidextrous safety selector instead of our Radian Talon 45/90 ambidextrous selector for compatibility during testing. Hammer Cocked – Selector on SAFE The image above s...

  We recently took on a unique project here at the shop: a custom build chambered in .277 SIG Fury. If you aren't familiar, this is the civilian commercial variant of the US Army’s new 6.8x51mm cartridge. It’s an incredibly capable round, but building for it comes with a specific set of rules and mechanical constraints that deviate from your standard black rifle build. Here is a breakdown of how we approached this build and why we made certain component choices. The Pressure and Platform Reality First, let’s talk logistics. The .277 Fury requires an AR-10 (SR-25/Large Frame) platform, not your standard AR-15. Because of this, we couldn't use our own Frog Arm LLC FAL-15 lower receivers, which are strictly mil-spec AR-15 dimensions. Instead, we sourced a high-quality AR-10 lower from another manufacturer to lay the groundwork. Second, a massive caveat on pressure: the military's 6.8x51mm round utilizes a hybrid stainless steel/brass case to handle a staggering 80,000 psi of c...