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upon further research the owners manual says WARNING! In order to get the best performance and not to damage the shotgun, heavy load piston must be used with the shells which are 36 grams or 1 1/4 ounce and above page 15 https://www.budsgunshop.com/prod_mans/00705-0000142860-001.pdf so in reguards to the npoble sport #4 buck loads you should install the heavy piston

Hi Lanny and welcome. This video may help: https://www.youtube.com/watch?v=fefT2MypMhY

Hi Lanny, do you mean the heavy load piston? 1) Make sure magazine is removed. 2) Using the provided spanner wrench loosen and remove the castle nut that holds the handguard in place in the clockwise direction. NOTE: LEFT HANDED THREADS. 3) Remove the O ring if it does not remain in the groove of the handguard nut. 4) Using a hex/Allen wrench, remove the bolt that holds the upper and lower together. 5) Gently pull away the handguard towards the muzzle to remove. 6) Remove the Philips screw that holds the back stock pad in place. 8) By pulling the lower receiver back push and lift on the upper receiver to separate the two. 9) Remove the gas system locking nut in the clockwise direction. NOTE: LEFT HANDED THREADS. 10) Twist off the gas piston cup and the rest of the piston system can be removed. . See disassembly video here >>> youtube.com/watch?v=fefT2MypMhY