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Hi William, yes, the Glock 21 Gen 4 features a rail for mounting accessories, allowing for the attachment of lights and other devices. Stay safe & have a great day!

Hi William and welcome. Yes Sir. It has a single slot accessory rail as pictured here: https://www.guns.com/firearms/p/glock-g21-g4-45acp-13-1-fs-3-13rd-mags-accessory-rail-45-acp?i=124402 ---------- Cheers and stay safe!

Yes it does.

William, it does but it is only a single slot, so if it were me i would start looking into lights or lasers that are fairly small.

Hello William, Yes the Glock 21 Gen 4 features one available slot for mounting accessories. Hope this helps and enjoy the rest of your day!