Funny, I have a couple of Underwoods and an NLD too. They have gotten really hard to find over the past couple of years. The Underwood is WW2 USGI, the NLD is USGI made sometime in the early 1960's. I thought Bill Ricca had a writeup on the recoil checks, but I guess not? Here's a picture of my $5 NLD "flash hider"

Delevopment of Recoil checks
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