I had a couple, they're hard enough you could stand on them and not bend them.
I had a Marlin Rockwell, those early guns were a Machine Rifle and beautiful. By the time they came out with NESA they were plow parts...rough as guts.
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photo shows magazine guide to load with five round M1903 stripper clips into the BAR magazine.Attachment 110962
never a common accessory to find
Yes, extraction was a major problem in early autoloaders. Garand's Primer guns had oil pads in the mag well, and Pederson's rifle used waxed bullets. JCG solved it with his turning bolt that "unscrewed" the casing. It was a major plus in the 1931 competition that killed the Pederson and led to the adoption of the Garand.
A few BAR specific items I have left. The magazine on the left is a new Ohio Ordinance product as are several other parts, several I picked up on line or gun shows.
https://www.milsurps.com/images/impo.../WL1Rs8r-1.jpg
https://www.milsurps.com/images/impo.../FoqIxTl-1.jpg
https://www.milsurps.com/images/impo.../2sYTOnH-1.jpg
https://www.milsurps.com/images/impo.../C9QMFCk-1.jpg
Early wood 1918A1 butt stock, Seymour case hardened follower for magazine thought to improve feeding but became a spare part.
Very rare Model 1918A1 bipod using during early WW2 until replaced by 1918A2Attachment 110964Attachment 110965Attachment 110966Attachment 110967Attachment 110968Attachment 110969
I made the mistake once of not patching out dry before I shot. Although I didn't notice anything whilst shooting, It took me forever to get the bore to look clean - like burnt grease on a frying pan that doesn't come up no matter how hard or what you scrub it with. After a week I finally discovered JB bore paste.
I would imagine oiling bullets has a similar effect of burnt oil.