Iboos, Don't fret using a Model 10 Riot for Vietnam portrayal. I have a good friend who was a 2 tour LRP who carried a Remington Model 10 when the got too frustrated with his early M-16 breaking down. His Arms Room had a dozen M-10 Riots and he took one as his own. Shotgun on point was normal for his unit. The M-10 may have been officially retired, but many lingered on...
TFIW!