PSA Sabre Ambi Mil-Spec Receiver Set

The PSA Sabre Ambi Mil-Spec Receiver Set is the conventional-profile entry in the Sabre receiver line. PSA built it in response to demand after the Sabre Enhanced launch: builders wanted the pre-installed ambidextrous bolt catch and release without the billet-styled magwell that came with it. The set launched Friday, August 14, 2026, in six finishes: black anodized plus Burnt Bronze, Blue Titanium, Flat Dark Earth, Moss Green, and Champagne Cerakote. As with the rest of the Sabre receiver line, the upper and lower are finished as a pair.

The ambidextrous bolt catch and release is the one Sabre control that carries over. A paddle on the right side of the lower lets the firing hand lock the bolt to the rear and drop it without rolling the rifle or breaking the firing grip, which is the single control most AR builders otherwise add aftermarket. It does not include an ambidextrous magazine release or an ambidextrous safety selector; a fully ambidextrous rifle still needs both of those as separate parts. Everything the Enhanced set added on top of the ambi catch is gone here: no flared magwell, no trigger guard machined into the receiver, no threaded set screw in place of the bolt-catch roll pin.

PSA published one caveat with the launch. The ambi bolt catch does not use mil-spec geometry, and some rifles will need tuning to lock back on an empty magazine as a result. PSA's guidance is to close down an adjustable gas block if the build has one, or to move up in buffer weight if it does not. Both slow the bolt carrier, which gives the magazine follower time to drive the catch into the path of the bolt. Budget for a heavier buffer if the host rifle already runs overgassed.