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Hi Duane, yes sir, this will mate with a DB lower. Stay safe & have a great day!

Yes it will fit the Diamond Back just fine

Yes, it will fit & function properly, as it should.

Hi Duane and welcome. This will mate to the DB Mil-Spec lower no issue. Check for any wobble/play also. If not tight enough fit, use an accu-wedge: https://www.midwayusa.com/product/100340833?pid=518277 --------- Cheers, stay safe and enjoy!