Remington.
Can't be answered without the serial number.
The commercial name of Nylon 66 is Perlon.
Nylon 66 is more crystalline than the polyethylene.
it looks like in the blue book that the mod.# is nylon 66
There is a video on how to assemble and disassemble a nylon 66 on youtube.com
Nylon 66 is made up of repeating units of adipic acid and hexamethylenediamine. These two monomers combine through condensation polymerization to form the polymer structure of nylon 66, which consists of alternating amide linkages.
nylon 6 and nylon 66 are the two most briefly divided types of nylon.
What is it doing that you think is a problem? This is a gun with a long and successful run.
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Nylon 6 has a lower melting point and is more flexible, making it suitable for applications requiring elasticity like textiles. Nylon 66 has a higher melting point and better resistance to heat and chemicals, making it ideal for mechanical parts and industrial uses. Additionally, Nylon 66 has better tensile strength compared to Nylon 6.
I own a Remington Nylon 66 BD and it's in perfect condition the current price for it is $820.00. It does depend on the condition of the gun and the model of the Remington 66. I have seen the same rifle models go for $610, but they were in fair condition. In 1967-1968 the serial numbers were located in the bottom of the barrel 3" back from the muzzle and should be 19012-473710. The lower serial numbers were made in 1967 and the higher serial numbers where made in 1968. If you not sure which model of Remington Nylon 66 you have check out wikipedia and you should find your answer there or find a local gun expert.