This is a Maglula ltd. Magloader known as the Range Benchloader chambered in 223 Remington, model BL71B.
The new Range BenchLoader(R) loader is heavy-duty industrial 5.56 x 45 / .223 cal magazine loader made to load a magazine in a single hand stroke. It is intended for daily loading of hundreds of magazines at shooting ranges and armories. It totally eliminates any fingers' pain and injury" shortens loading time" and keeps the magazines lips intact.
Features:
Fits and Loads AR15 / M4 Compatible 5.56x45 / .223 Magazines
Shortens Loading Time
