Diamondback's manual recommends that the user fire between 50 and 100 rounds to break the gun in before carrying it. That's prudent advice. I had at least one failure to extract on my first three magazines through the DB380 before the problem evaporated. Once I got the gun home I disassembled it, thoroughly cleaned it, and lubricated it and I haven't had any failures since.
Disassembly of the DB380 for routine cleaning is easy and requires no special tools. Start by removing the magazine and clearing the chamber. Once you've established that the gun is completely unloaded, pull the trigger (with the muzzle pointed in a safe direction), releasing the striker. Next pull the slide back just far enough to allow the assembly catches to be pulled down, then release the slide, letting it go forward and off the frame.
With the slide in hand turn it over so that the recoil springs are facing upward. Push on the recoil spring guide head and lift out of the slide. Now lift up on the chamber end of the barrel, slide it forward, and then lift it out of the slide.
Reassembly is in reverse order. Once the slide unit has been reassembled, line up the slide rails with the frames' rails and push the slide on until the assembly catches engage completely. I like to put a drop or two of oil on the slide rails and use lithium grease on the frame rails. After assembly, I rack the slide back and forth 20 to 30 times to get the lube where it needs to be and wipe off the excess.
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