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A few things to check - some may seem overly obvious but humor me:
1) Check your nails - make sure they are the correct angle and gauge
2) Check to make sure there is not a piece of a broken nail in the nose
3) Check the driver blade & insure it is not bent or chipped
4) Make sure the nail carrier spring is pushing nails forward and isn't getting hung up
Any nail or staple with the same specs can be used. For finish nails it
would be the gauge (15, 16, and 18 being the most popular sizes) and
angle (if angled and not straight sticks of nails), for staples it would
be wire gauge and crown width, for nails it would be the nail diameter
(.090, .099, .131 are examples), the nail angle in degrees (NOT counting
a roofing nailer, some other coil nailers us slightly angled nails such
as 15 degrees) and this is very important with a stick nailer as there
are a few different ones out there, and of course max length your tool
will shoot of any given fastener. Most boxes of nails/staples will have
the specs you need printed on them somewhere and the owners manual will
usually contain the same info.
Generally two reasons for nails not to make contact with driver. Make sure that the driver is returning to top of cylinder. If it stays in the path of the nail feeder, the nail cannot slide into position. Second, nails are not the right type or gauge for gun. Some nails even if they are the right gauge have a large head not allowing the strip to enter into chamber. Remove air hose from gun, check that piston is all the way up, then slide nails into chamber and see if they go all the way in easily with-out having to push. You should see the first nail in place from bottom where nail shoots out. The angle of the nail is very important. most pin nailers are 0 degree (not angled), but others have an angle. The gun should be labeled as to angle of nail. Hold a strip of nails against the outside of the magazine and see is the first nail is in line with the driver path. Good luck and post again if you have other question.
if thats a hitachi nr90ad, then you should be using 30 degree paper taped clipped headed nails,, never use plastic or wire collated nails in that gun,, some boxes might say 30 up to 34 degree and thats fine, also in a lot of areas clipped headed nails are no longer code, so they made the nails full headed, the head is just off set,,
I worked at at tool rental center while attending college and learned from the old tool masters about nails and nailers. Rental stores have many different brands of nailers to rent and customers would bring their own nails of all brands. You will notice on the case/box that your nails will /should work on many other brands however the degree or angle of the nails is not always exacly as stated on the box. You should check with protractor the exact angle of your nails and also check the exact angle of the nailer. Use straight edge on travel path of the piston and another on guide rails to check angle of the gun. You will discover that all is not as stated as in a perfect world. If the angle is off slightly, the head of the second nail will get into the path of the driver. This happens mostly with clip head because the nail heads are so close together. The full round head is spaced further apart with less jamming. If angle is off slightly, take a look at other brands of nails with protractor in hand, the angle will be different slightly or choose a slightly thicker nail. Look for the nails to fit with bottom of nail hitting the barrel first. This will move the head of the nail slightly away from the center line. Finally do not release pusher with force as this will jamb nails closer together. Good Luck!?
The Dewalt D51844 uses a full round head 20 degree nail. Sometimes the generic brand nails are not made exactly to the stated degree. They do this so their nails will work on a variety of nailers. Best to check the nails angle in relation to the angle of your nailer. Place a strip of nails on the outside of the rail. Align the heads of the nails to a convenient straight edge on the rail then check that the head and shaft of the first nail is aligned with the barrel. If the lower part of the nail projects out further than the head, then the driver will miss the head. If the head of the first nail appears close enough to barrell for the driver to hit it then place a new strip of nails into the mag and slide the pusher foward. Fire one nail, if success, remove the nails from the mag and check if the plastic holding the nails together is projecting in front of the first nail. Sometimes the plastic is not right, too stiff, and will not let the next nail align with the barrell. If the next nail appears ready and slides forward then the driver may not be going all the way up after shot. Check by inserting a metal rod into barrell and push driver up till it stops. If the driver is in the uppermost position, then most likely brand of nails. Use Dewalt nail. Good Luck