Just made one using a DML m16a1.
I Had a 21st C TMP I Got in a Ebay auction So I Used the silencer on a DML M16A1 and it fits perfectly! I Dont know if the 21st TMP is rare or not but if you have one and want a silenced M16A1 Well there ya go!
Ive Also Watched this Pretty good Vietnam Era movie Called "Under Heavy Fire"
Lots of Kitbash ideas.