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Hi Hao, recommended from the Maxim Defense web site, if your DB15 is 5.56 or 300 Blackout, you want this standard size. If you have the 7.62 x 39 model, you want the heavy size. Note - The JP Silent Captured Spring Systems require an open channel in your bolt carrier group assembly for the guide rod to pass during fire. Stay safe & have a great day!

Hi Hao and welcome. Yes Sir, this will fit the stock Diamondback DB-15 no issue. The standard model is recommend for best performance from caliber 5.56 and 300BLK. Cheers, stay safe and enjoy!