try the schematics pages on Numrich Arms website. Most popular rifles are shown and most parts are available.
Go here and find the Gun Digest Assembly/Disassembly book for Sporting Rifles:http://www.krausebooks.com/category/firearms_knives
Take it to a gunsmith and ask for help.
What Model 51 pistol or a rifle and what model?
Go to Remington's web site and you can request a manual for free.
Go to Remington's website and and you can download one or have one mailed to you.
To remove the barrel you first pull back on the carrier finger latch and lock the bolt in the open position, then remove the magazine end cap. Remove the forend wood and then the gas cylinder collar...
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