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it should however the last round lock back is a feature of proper spring tension and these types of mags can vary quite a bit

Richard, the Magpul will lock the bolt back Sir. Cheers and stay safe!

Yes, this will hold the bolt back on the last round. Hope this helps.

Yes, Magpul is quality stuff my go to in most all circumstances, the only exception is with an AK then its palm us magazines, or circle 10. But anyway yes this'll lock the bolt back.

Yes, copy and paste from magpul website. "PMAG D-50® GL9® – PCC Easily disassembled for cleaning and featuring an innovative bolt hold-open feature, the D-50 GL9 – PCC reliably locks the bolt back on empty when used with firearms designed to lock back on Glock pattern magazine followers." -------------------------- https://magpul.com/firearm-accessories/pmags/glock/pmag-d-50-gl9-pcc.html