I found a Triggerguard for my NPM

[phil441]

I think what Rick is getting at is, even though BrianQ says this is so, unless it's published somewhere in a book he can plop down on a dealer's counter, it means little. BrianQ knows much, but without accepted references it amounts to little more than an opinion. Newsletters, however valuable, are just a club's newsletters.
Brian has shown little to no interest in publishing a book based on his vast knowledge to be judged by the collecting community. Until that happens, his opinion is only that. Highly regarded, but nothing you can take to the bank. Or a dealer.