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Tried it on a few lowers. Works on Alex Pro best. The mags are proprietary. I have tried multiple aftermarket mags none work. The mags feed fine in the Alex pro lower. I changed the spring to an AR 15 spring and it runs bird shot fine. With ar10 buffer spring anything under 1300 FPS will short stroke. Again! AR 10s are not mil spec. So do ur due diligence . It’s not a perfect match when trying to fit DPMS versions. I run into it All the time.
Received upper quickly, goes for most items if they are in stock. Fit an Alex Pro AR10 lower dpms gen 1 compatible. Fitmen was super tight, but got it squeezed in. Cycles with mags. Can’t wait to shoot some clays . Will let u know how it runs with high and low brass also will check buffers and springs. Can anyone find magazines for this? Tried black river and does not stay seated.