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As a generality, buy a can of automotive Knock R Loose, penetrating oil, one of the ones that dissolves rust corrosion and loosens frozen parts. The orange and black can works best.
I am generally ignorant of disassembly, but the feed lips on the lifter assembly are up into the receiver tube. The assembly may have to come downward first as its first motion. Not rearward out if the magazine tube. Which MIGHT mean getting the magazine tube forward first.
Don’t force it down. It will bend to H.
The lifter assembly seems to go into the mag tube. The automotive stuff chemically heats and dissolves some rust stuff.
There is a hint in this thread that mag tube removal is a Rat Sc…
www.rimfirecentral.com
The short version is the mag outer tube is put through the dovetail lug, and probably on to the lifter, and then a punch through the lug screw hole dents the tube. The dent is upward and outward of the tube towards and into a recess in the lug‘s barrel side. I am thinking getting the lug off and the outer tube out is a hammer job. Read the thread. Never intended to be disassembled, in my opinion.
Photo: Like top view.
From this thread. Pictures come and go invisible in old thread. Copied to here.
www.rimfirecentral.com
Its entirely possible to clean and restore function without removing the lifter assembly. Spray, brush, flush. Repeat. Get the auto rust cutter.
The parts in your photo don’t look all that bad. Getting the lifter screws out means the assembly isn’t all that corroded. The inside of the mag tube is what matters, not the outside of the shell.
Should look like:
Parts:
I am generally ignorant of disassembly, but the feed lips on the lifter assembly are up into the receiver tube. The assembly may have to come downward first as its first motion. Not rearward out if the magazine tube. Which MIGHT mean getting the magazine tube forward first.
Don’t force it down. It will bend to H.
The lifter assembly seems to go into the mag tube. The automotive stuff chemically heats and dissolves some rust stuff.
There is a hint in this thread that mag tube removal is a Rat Sc…

Springfield 87A..remove magazine tube
I want to refinish an old rusted 87A. I have the bolt assy out and the trigger assy off but cant see the best way to remove the magazine tube and feed. What is the trick to taking it off?
The short version is the mag outer tube is put through the dovetail lug, and probably on to the lifter, and then a punch through the lug screw hole dents the tube. The dent is upward and outward of the tube towards and into a recess in the lug‘s barrel side. I am thinking getting the lug off and the outer tube out is a hammer job. Read the thread. Never intended to be disassembled, in my opinion.
Photo: Like top view.
From this thread. Pictures come and go invisible in old thread. Copied to here.

Springfield 87A..remove magazine tube
I want to refinish an old rusted 87A. I have the bolt assy out and the trigger assy off but cant see the best way to remove the magazine tube and feed. What is the trick to taking it off?
Its entirely possible to clean and restore function without removing the lifter assembly. Spray, brush, flush. Repeat. Get the auto rust cutter.
The parts in your photo don’t look all that bad. Getting the lifter screws out means the assembly isn’t all that corroded. The inside of the mag tube is what matters, not the outside of the shell.
Should look like:
Parts: