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Luis, adding this will make your P50 a short barreled rifle requiring a $200 tax stamp and registration with the ATF BEFORE you convert it. Once converted to a SBR, it cannot be changed back to a pistol without notifying the ATF. More info here https://www.budsgunshop.com/nfaguidelines.pdf Stay safe & have a great day!

Hi Lewis and welcome. Since the P50 has a less than 16 inch barrel, you would need to register with NFA and pay a $200 Tax Stamp to make the conversion you ask about legal. Same process as applying for a silencer. Otherwise, it is illegal to make the modification. Cheers and stay safe!