Some quick notes on the 25 -
The parts shown @ Gunparts are correct. http://www.gunpartscorp.com/Manufact...731.htm?page=1
The lifter assembly consist of parts 41 thru 47 and is held in the receiver by the take-down screw bushing (not listed) - I didn't know if you need just some of these parts or all of them - I don't think it's feasible to make the carrier, part #47. The 25 is basically an improved 1914 and works the same, the lifter/carrier assembly is operated by slots milled into the slide arm and there is not much depth to the cuts and not much metal left between the slots making this part prone to damage so that should be checked.
The magazine's for Savage pumps are not a standard size and the one for the 25 is unique to it. The outer tube is reduced in diameter on the end that slips into the receiver so it's ID matches the ID of the inner magazine tube, the means the inner tube has to stop short of this point requiring a very long follower to extend out far enough to push the last cartridge far enough into the receiver - the pictures show this but the inner & outer tube are pictured going opposite directions. The magazine is held on by a small screw and a ring. The screw is an odd size, I think a #5 and I think the same as for the later Model 29's which are available from other sources. The magazine ring is just a spring steel circular piece with two ears that clip into two angled slots milled in the barrel. There are at least two different version of these, the early 1914 ones held the magazine tube tight to the barrel & the later ones for the 1914 & 25 spaced it slightly away.
Here are some old pictures that show some of the internals, first is just a 25 and the next a 1914 and a 25 -
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