The IBC/R has an enlarged top paddle, the lower 50% of the top paddle is canted at 5 degree, the upper 50% is canted at 10 degree. The combined effect is the top paddle is easier to use, not solely based on its larger size, but because its angles. When the bolt carrier is locked back, the canted top paddle is much easier for the palm or thumb to access.
The lower paddle of the IBC/R is canted at 10 degree. With or without a Norgon Ambi-catch in place, accessibility has been vastly improved. The IBC/R’s angled lower paddle is on a separate vertical plane than the Ambi-Catch, making identification far more intuitive, both visually and by feel.
The notch immediately above the IBC/R’s lower paddle isn’t there by accident. As you run your finger down the bolt catch towards the lower paddle, the notch is meant to give you tactile feedback “the top portion of the bolt catch is ending, you’re about to approach the lower paddle”
The lightening cuts on the IBC/R are there to make its weight as close to the factory weight as possible (0.445oz vs. 0.401oz), the IBC/R isn’t meant to be a lightweight component.
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