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The magazines for the #4 & #5 rifles are interchangeable within a caliber. In other words any .303 magazine for any #4, or #5 can be swapped. However you may need to do some minor fitting to the feed lips to get good reliability as the magazines weren't designed to be interchanged.
#1 magazines are not interchangeable between #1 & #4 rifles.
Magazines for different calibers are (mostly) not interchangeable.
Try NUMRICH ARMS (e-gunparts.com), or SARCO for a replacement.
Quick & dirty reference for which rifle you have.
Almost no barrel visible at front end of stock, there is a big metal reinforcement of the wood at the muzzle & the sights are a V-notch type part way down the barrel, you have a #1.
There is about 2~3" of barrel sticking out the end of the wood & the sight is a peep at the rear of the receiver, you have a #4 rifle.
There is no wood on the forend past the band with 18" or so of barrel sticking out & there is a cone-shaped gadget on the end of the barrel, you have a #5 rifle.
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