Who are the manufactures for RP on some parts and BP on bolt sleeves I have seen?

Thank you.

82ABN DIV 6yrs, Jump Master, Cobra Crewchief, Grenada, USAF 15yrs, F-4's & F-16's, Crewchief, Pro Super, Retired, now working USAF at Depot on F-15's & AC-130's
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