DPMS AR-15 Flipper Upper/Lower Receiver Block One Size. This DPMS factory manufactured part is made to the highest standards and workmanship. Feel confident when using DPMS parts in your rifle. "The Flipper" made of Delrin is a versatile armorer's tool. Clamp into your vise and it holds any AR upper or lower receiver for assembly purposes. Specifications for DPMS AR-15 Flipper Upper/Lower Receiver Block: Manufacturer: DPMS Gun Model: AR-15 Gun Make: AR Platform Package Contents: DPMS AR-15 Flipper Upper/Lower Receiver Block What firearm models does the manufacturer say DPMS AR-15 Flipper Upper/Lower Receiver Block is compatible with? The manufacturer suggests that DPMS AR-15 Flipper Upper/Lower Receiver Block is compatible with AR-15DPMS DP51655131038: AR-15 Flipper Upper/Lower Receiver Block One Size