I stand corrected. you're both right. The M-14 was issued after the Korean war and Kyle was a Navy Seal.
Regarding your bullpup choice. That is a pretty good one. I had an Keltec RFB (.308) for a couple of years and enjoyed it. I sold it because I couldn't get a longer barrel (16" was the only one offered).
I liked it because it was really compact and it ejected the case from the front, a real improvement from side ejection. It also had a piston with the adjustable gas plug, meaning that it was designed with a suppressor in mind.
If Keltec builds another model with a 20"+ length barrel I would buy it and send it off to have NP-3 coating applied to it. That would be another keeper for me.