Which is not anything unusual, of course!

...the early gas cylinder lock screw is concerned, the pin on the grenade launcher was purposely made too large to fit the hole in the early lock screw, so the launcher could not be mounted until the poppet type screw was installed.
Um... er... yep! Dunno where I came up with what I did, but I did know that the semicircular "relief cut" was to alleviate the stress resulting from a 90-degree machine cut. and had nothing to do with greande launching.

(I shoulda read Bill Ricca's "Myths" page, which Badger has stickied on this forum.)

Ben Hartley